Spatial patterns and driving forces of land use change in China during the early 21st century

Land use and land cover change as the core of coupled human-environment systems has become a potential field of land change science (LCS) in the study of global environmental change. Based on remotely sensed data of land use change with a spatial resolution of 1 km x 1 km on national scale among every 5 years, this paper designed a new dynamic regionalization according to the comprehensive characteristics of land use change including regional differentiation, physical, economic, and macro-policy factors as well. Spatial pattern of land use change and its driving forces were investigated in China in the early 21st century. To sum up, land use change pattern of this period was characterized by rapid changes in the whole country. Over the agricultural zones, e.g., Huang-Huai-Hai Plain, the southeast coastal areas and Sichuan Basin, a great proportion of fine arable land were engrossed owing to considerable expansion of the built-up and residential areas, resulting in decrease of paddy land area in southern China. The development of oasis agriculture in Northwest China and the reclamation in Northeast China led to a slight increase in arable land area in northern China. Due to the "Grain for Green" policy, forest area was significantly increased in the middle and western developing regions, where the vegetation coverage was substantially enlarged, likewise. This paper argued the main driving forces as the implementation of the strategy on land use and regional development, such as policies of "Western Development", "Revitalization of Northeast", coupled with rapidly economic development during this period.

STUDY ON THE SPATIAL PATTERNS OF LAND-USE CHANGE AND ANALYSES OF DRIVING FORCES IN NORTHEASTERN CHINA DURING 1990-2000

Land-use change is an important aspect of global environment change. It is, in a sense, the direct result of human activities influencing our physical environment. Supported by the dynamic serving system of national resources, including both the environment database and GIS technology, this paper analyzed the land-use change in northeastern China in the past ten years (1990 - 2000). It divides northeastern China into five land-use zones based on the dynamic degree (DD) of land-use: woodland/grassland - arable land conversion zone, dry land - paddy field conversion zone, urban expansion zone, interlocked zone of farming and pasturing, and reclamation and abandoned zone. In the past ten years, land-use change of northeastern China can be generalized as follows: increase of cropland area was obvious, paddy field and dry land increased by 74. 9 and 276. 0 thousand ha respectively; urban area expanded rapidly, area of town and rural residence increased by 76. 8 thousand ha; area of forest and grassland decreased sharply with the amount of 1399. 0 and 1521. 3 thousand ha respectively; area of water body and unused land increased by 148. 4 and 513. 9 thousand ha respectively. Besides a comprehensive analysis of the spatial patterns of land use, this paper also discusses the driving forces in each land-use dynamic zones. The study shows that some key biophysical factors affect conspicuously the conversion of different land- use types. In this paper, the relationships between land- use conversion and DEM, accnmlated temperature(>= 10 degrees C) and precipitation were analysed and represented. We conclude that the land- use changes in northeast China resulted from the change of macro social and economic factors and local physical elements. Rapid population growth and management changes, in some sense, can explain the shaping of woodland/grassland - cropland conversion zone. The conversion from dry land to paddy field in the dry land - paddy field conversion zone, apart from the physical elements change promoting the expansion of paddy field, results from two reasons: one is that the implementation of market-economy in China has given farmers the right to decide what they plant and how they plant their crops, the other factor is originated partially from the change of dietary habit with the social and economic development. The conversion from paddy field to dry land is caused primarily by the shortfall of irrigation water, which in turn is caused by poor water allocation managed by local governments. The shaping of the reclamation and abandoned zone is partially due to the lack of environment protection consciousness among pioneer settlers. The reason for the conversion from grassland to cropland is the relatively higher profits of fanning than that of pasturing in the interlocked zone of farming and pasturing. In northeastern China, the rapid expansion of built-up areas results from two factors: the first is its small number of towns; the second comes from the huge potential for expansion of existing towns and cities. It is noticeable that urban expansion in the northeastern China is characterized by gentle topographic relief and low population density. Physiognomy, transportation and economy exert great influences on the urban expansion.

The regional types of China's floating population: Identification methods and spatial patterns

With the rapid increase of the number and influence of floating population in China, it is urgently needed to understand the regional types of China's floating population and their spatial characteristics. After reviewing the current methods for identifying regional types of floating population, this paper puts forward a new composite-index identification method and its modification version which is consisted of two indexes of the net migration rate and gross migration rate. Then, the traditional single-index and the new composite-index identification methods are empirically tested to explore their spatial patterns and characteristics by using China's 2000 census data at county level. The results show: (1) The composite-index identification method is much better than traditional single-index method because it can measure the migration direction and scale of floating simultaneously, and in particular it can identify the unique regional types of floating population with large scale of immigration and emigration. (2) The modified composite-index identification method, by using the share of a region's certain type of floating population to the total in China as weights, can effectively correct the over- or under-estimated errors due to the rather large or small total population of a region. (3) The spatial patterns of different regional types of China's floating population are closely related to the regional differentiation of their natural environment, population density and socio-economic development level. The three active regional types of floating population are mainly located in the eastern part of China with lower elevation, more than 800 mm precipitation, rather higher population densities and economic development levels.

The spatial pattern of the small fish community in the Biandantang Lake - a small shallow lake along the middle reach of the Yangtze River, China

The spatial pattern of the small fish community was studied seasonally in 1996 in the Biandantang Lake. Based on plant cover, the lake was divided into five habitats, arranged in the order by plant structure complexity from complex to simple: Vallisneria spiralis habitat (V habitat), Vallisneria spiralis-Myriophyllum spicatum habitat (V-M habitat), Myriophyllum spicatum habitat (M habitat), Nelunbo nucefera habitat (N habitat), and no vegetation habitat (NV habitat). A modified popnet was used for quantitative sampling of small fishes. A total of 16 fish species were collected; Hypseleotris swinhonis, Ctenogobius giurinus, Pseudorasbora parva, Carassius auratus and Paracheilognathus imberis were the five numerically dominant species. In both summer and autumn, the total density of small fishes was about 10 ind m(-2). Generally, Ctenogobius giurinus, a sedatory, benthic fish, was distributed more or less evenly among the five habitats, while the other four species had lower densities in the N habitat and NV habitat, which had the simplest structures. The distribution of the small fish species showed seasonal variations. In winter, most species concentrated in the V habitat, which had the most complex structure. In spring, the fish had low densities in the N and NV habitat, and were more or less evenly distributed in the other habitats. In summer, the fish had a low density in the NV habitat, and were evenly distributed in the other habitats. In autumn, the fish had higher densities in the V-M and M habitats than in the others. Generally, spatial overlaps between the dominant species were higher in winter than in the other seasons. It was suggested that the variations in the importance of predation risk and resource competition in habitat choice determined the seasonal changes of spatial patterns in the small fishes in the Biandantang Lake.

Spatial variability in water quality and surface sediment diatom assemblages in a complex lake basin,lake of the woods,ontario,canada

Lake of the Woods (LOW) is an international waterbody spanning the Canadian provinces of Ontario and Manitoba, and the U.S. state of Minnesota. In recent years, there has been a perception that water quality has deteriorated in northern regions of the lake, with all increase in the frequency and intensity of toxin-producing cyanobacterial blooms. However, given the lack of long-term data these trends are difficult to verify. As a first step, we examine spatial and seasonal patterns in water quality in this highly complex lake on the Canadian Shield. Further, we examine surface sediment diatom assemblages across multiple sites to determine if they track within-take differences in environmental conditions. Our results show that there are significant spatial patterns in water quality in LOW. Principal Component Analysis divides the lake into three geographic zones based primarily on algal nutrients (i.e., total phosphorus, TP), with the highest concentrations at sites proximal to Rainy River. This variation is closely tracked by sedimentary diatom assemblages, with [TP] explaining 43% of the variation in diatom assemblages across sites. The close correlation between water quality and the surface sediment diatom record indicate that paleoecological models could be used to provide data on the relative importance of natural and anthropogenic sources of nutrients to the lake.

Study on spatial pattern of land-use change in China during 1995-2000

It is more and more acknowledged that land-use/cover dynamic change has become a key subject urgently to be dealt with in the study of global environmental change. Supported by the Landsat TM digital images, spatial patterns and temporal variation of land-use change during 1995 -2000 are studied in the paper. According to the land-use dynamic degree model, supported by the 1km GRID data of land-use change and the comprehensive characters of physical, economic and social features, a dynamic regionalization of land-use change is designed to disclose the spatial pattern of land-use change processes. Generally speaking, in the traditional agricultural zones, e.g., Huang-Huai-Hai Plains, Yangtze River Delta and Sichuan Basin, the built-up and residential areas occupy a great proportion of arable land, and in the interlock area of farming and pasturing of northern China and the oases agricultural zones, the reclamation I of arable land is conspicuously driven by changes of production conditions, economic benefits and climatic conditions. The implementation of "returning arable land into woodland or grassland" policies has won initial success in some areas, but it is too early to say that the trend of deforestation has been effectively reversed across China. In this paper, the division of dynamic regionalization of land-use change is designed, for the sake of revealing the temporal and spatial features of land-use change and laying the foundation for the study of regional scale land-use changes. Moreover, an integrated study, including studies of spatial pattern and temporal process of land-use change, is carried out in this paper, which is an interesting try on the comparative studies of spatial pattern on change process and the change process of spatial pattern of land-use change.

鄂尔多斯高原景观要素空间格局及植物与环境关系的定量解析

鄂尔多斯高原是一个多层次、复杂的生态过渡带，具有复杂多样的环境条件、生态特点，因此也就具有复杂多样的植物与环境关系。本文从群落和景观两个尺度水平上研究鄂尔多斯高原植物或植被与环境关系及景观空间格局。利用鄂尔多斯高原野外植物群落样方调坦数据、微生境环境数据、气候数据，以典范对应分析（Canonical Correspondence Analysis, CCA）的方法分析了鄂尔多斯高原植物分布空间格局与环境要素的关系并对秋类环境要素对鄂尔多斯高原植物空间分布格局的贡献进行了定量分解;利用1:500 000 鄂尔多斯高原植被、土壤、土地利用、土地沙漠化类型等专题地图在GIS支持下分析了鄂尔多斯高原景观空间格局、并利用上述专题图数据加上鄂尔多斯高原气候数据库分析了土壤、土地利用、土地利用、土地沙漠化和气候等对鄂尔多斯高原植被空间分布格局的作用。通过分析，得到了以下主要结论： 1 在分析方法上、利用典范对应分析的方法，把植物分布的空间因素与环境因素分离的方法发展为植物分布空间格局不同类型影响因素作用的定量分离，提出了相应的概念模型和实现方法。 2 影响鄂尔多斯高原植物分布空间格局的主要微生境环境要素是基质类型、地下水位、覆沙厚度等，而影响鄂尔多斯高原分布空间格局的主要气候要素中，降水和干湿指标的作用大于温度和热量指标的作用。 3 通过对鄂尔多斯高原植物分布空间格局与环境关系的研究，以植物对微生境环境要素的反应为根据，把鄂尔多斯高原主要植物划分为4个大类群：梁地植物、沙地植物、草甸植物和耐盐植物。根据它们对气候要素的反应，把鄂尔多斯高原主要植物划分为典型草原植物、荒漠草原植物和草原化荒漠植物3大类。进一步，根据鄂尔多劳动保护高原植物与环境关系的研究，进行了鄂尔多斯高原植被功能型划分的尝试，得到了鄂尔多斯高原的12种主要植被功能型。 4 对鄂尔多斯高原植物分布的空间格局的影响环境因素的贡献作了定量地分解。分析结果显示：鄂尔多斯高原植物分布空间格局中有27.02％可由已知环境变量得到解释，其中21.56％与微生境环境要素相关，7.51％与气候要素的作用有关，而气候与微生境环境要素的耦合作用的份额为2.05％。根据植物生长是否直接受到地下水的影响，鄂尔多斯高原存在两大类型生态特点差异明显的生境类型：中性立地和隐域生境，对两大类型生境上影响植物空间分布格局的环境要素的作用也进行了定量分解。分析结果表明：对于植物生长不直接受地下水影响的中性立地，已知环境要素的作用可以解释植物空间分布格局总信息的29.36％，稍大于对总体上鄂尔多斯高原植物分布空间格局的解释，其中9.23％与气候要素相关，22.08％与微生境环境要素相关，而两种类型环境要素的耦合作用则占1.95％。对于植物生长直接受到地下水影响的隐域生境，所有已知环境要素对植物分布空间格局的贡献率为72.28％，其中气候要素的作用为30.31％，微生境环境要素的作用为49.08％，两类环境要素的耦合作用为7.11％。 5 描述景观空间格局的指数多种多样，这些能数在描述特定区域的景观空间格局时是有信息冗余的。本文对利用FRAGSTATS所获得的鄂尔多斯高原植被、土壤、土地利用、土地沙漠化等景观分量的20个景观指数实施了因子分析。通过因子分析，我们可以把描述鄂尔多斯高原景观空间格局的景观指数归并为以下8类：多样性指数、斑块多度指数、斑块类型丰富度指数、斑块面积指数、斑块形状指数、分形维数、空间配置指数和斑块面积变异指数。通过因子分析，还得到了这些景观指数对描述鄂尔多斯景观格局的共性特征：在描述鄂尔多斯高原景观空间格局时，作用最大的是多样性指数、斑块多度指数、面积加权平均斑块形状指数和面积加权平均分形维数，其次是斑块类型丰富度指数、平均分维指数、平均形状指数和斑块面积指数，而空间配置指数（扩散与毗连指数）和斑块面积变异指数的作用则比较微弱。 6 对鄂尔多斯高原景观指数的因子分析是非常有效和成功的。因子分析对鄂尔多斯高原植被、土壤、土地利用、土地沙漠化景观指数的分析分别得到了5-6个主要因子，可以表达原有20个景观指数所表达信息的91.1-96.0％，即可以反应鄂尔多斯高原景观空间格局的大部分信息。本文所进行的因子分析对因子进行了方差最大化(Varimax)正交旋转的处理，因子分析得到的每一个主要因子都有一个或几个与之相关性非常高的景观指数与之对应，因此，就可以用与因子分析所得主要因子相关性最高的景观指数代替该主要因子来表达鄂尔多斯高原的景观空间格局。另外还因为有些景观指数之间具有极高的相关系数，所以对因子分析所得到的景观指数可以进一步精减，最后利用因子分析成功地把原有20个景观指数减少到了11个。最后被选来描述鄂尔多斯高原景观格局的景观指数有下列11个：MSIEI（修正的Simpson均匀度指数）、AWMPFD（面积加权平均斑块分形维数）、AWMSI（面积加权平均形状指数）、NP（斑块数目）、PR（斑块类型丰富度）、MSI（平均形状指数）、MPFD（平均斑块分形维数）、MPS（平均斑块面积）、PSCV（斑块面积变异系数）、DLFD（双对数分形维数）和IJI（扩散与毗连指数）。 7 鄂尔多斯高原植被、土壤、土地利用在景观组成结构上具有一个共同特点，就是各种类型的面积差异极大，少数类型占有极大比重，而其余面积则很小。产生这一情形的原因主要与人为活动的强烈影响有关，表现在地带性的植被与土壤面积所占的比重不高，沙地、沙生植被与风沙土则占有很大比重。 8 以地带性植被和滩地隐域性植被表示的鄂尔多斯高原的原生植被仅占高原面积的不足30％，而以地带性土壤和滩地隐域性土壤表示的原生性土壤占鄂尔多斯高原总面积的近40％，说明土壤退化不如植被退化严重，或滞后于植被退化。 9 鄂尔多斯高原各景观指数的空间变化曲线，植被与土壤很相近，具有非常相似的格局;土地利用景观格局空间变化特征与植被、土壤等明显不同;土地沙漠化的景观格局空间变化曲线介植被曲线、土壤曲线与土地利用曲线之间，说明土地沙漠化不仅是一个受人为活动影响的过程，而且与自然过程密切相关。 10 鄂尔多斯高原景观格局的空间梯度变化表现出了东西向和南北向的梯度，但总体上以东西向的变化比较明显。 11 通过鄂尔多斯高原土壤类型、土地利用、土地沙漠化等景观要素、气候、空间要素与鄂尔多斯高原植被空间分布格局的CCA分析，探讨了它们之间的相互关系。以对鄂尔多斯高原植被组成数据的总方差解释的百分率为标准，土壤对鄂尔多斯植被分布的空间格局的作用最大，其方差贡献率可达44.28％，其次是土地利用与鄂尔多斯高原植被的关系也很密切，土地利用对鄂尔多斯高原植被空间分布格局的方差贡献率为22.45％，空间因素对鄂尔多斯高原植被空间分布格局的贡献率为17.51％，土地沙漠化对鄂尔多斯高原植被空间分布格局的贡献为15.65％，排在第四位;气候因素对鄂尔多斯高原植被空间格局的贡献率为11.95％，居第五位。 12 在气候要素对鄂尔多斯高原植被空间分布格局的作用中，降水与干湿指标的作用大于温度与热量指标的作用。这一点与利用野外调查样方的群落数据植物与气候关系的分析是完全一致的。CCA分析还表明鄂尔多斯高原植被空间格局的东西向变化大于南北向分异。 13 在群落和景观水平上，鄂尔多斯高原植物空间分布或植被格局的影响因素的作用具有相似的格局，即气候因子的作用明显地小于地质、土壤、水文等微生境环境要素（群落水平）或土壤（景观水平）的作用，并在这两个尺度上气候要素对植物空间分布或植被格局的定量解释份额上也是非常相近的，都仅有10％左右。气候因子对鄂尔多斯高原植物空间分布格局的这种弱的解释能力，从侧面说明了人为活动等非自然因素对鄂尔多斯高原植物空间分布格局的强烈作用。 14 在鄂尔多斯高原生态系统管理上，应协调人与自然的关系;加强鄂尔多斯高原的生物多样性保育，对于本区生态和经济对非常重要的滩地，应协调好对其开发利用与保护的关系;在鄂尔多斯高原土地沙漠化防治方面，应把调整人地关系与自然生态背景与条件相结合，如使用“三圈”模式等生态系统管理模式等。

亚热带森林外生菌根真菌的生态学研究

菌根是一种植物营养根与土壤真菌形成的共生体，在自然界中分布广泛。外生菌根真菌是菌根真菌的重要类群，其宿主植物约占陆地植物总数的3%左右。由于外生菌根真菌的宿主植物常常是一些生态系统的优势种和建群种，并且这些真菌还参与了许多森林生态系统的有机和无机元素循环、物种的竞争和共存、生物多样性的维持、生态系统的演替等过程，因而对外生菌根真菌的研究有助于对这些生态系统维持和演替机制的深入理解。本文通过外生菌根真菌的种类鉴定和多样性，外生菌根真菌种群的遗传结构，外生菌根真菌群落的结构、空间格局及植物-菌根真菌空间关系，外生菌根真菌接种对植物生长和竞争的影响等四个方面的研究，使我们对这一地区的外生菌根真菌的种类组成、空间分布和传播规律、年度变化、以及对植物群落组成和多样性的影响等方面，有一个初步了解。 外生菌根真菌的鉴定和种类组成是进行菌根真菌研究的前提之一。在第一章中，主要通过子实体形态分类和分子方法，对大型真菌的种类进行了鉴定。在对东灵山和都江堰森林的调查中分别发现的大型真菌106种和98种，菌根真菌比例分别为44.3%和69.4%，木生真菌比例分别为16%和10.2%。按Fellner的评价标准，两个森林群落均属于健康的生态系统。我们应用ITS-RFLP和ITS序列比较的方法对地上子实体、地下菌根及分离培养的菌种进行了种类鉴定和分析。结果表明，ITS-RFLP可以用来进行外生菌根真菌的种类鉴定，而序列分析能够提供更为可靠的信息。二者的结合，可以使我们建立菌根真菌分子数据库成为可能。 种群遗传结构的研究包括种群中个体的空间分布和亲缘关系等方面，有助于加深我们对种群的生殖和传播方式，菌根真菌与风、雨、动物等生态因子的关系等方面的理解。第二章主要以两个外生菌根真菌种群为例，对种群遗传结构中空间距离与遗传相似性的关系、种群结构的年度变化等方面进行了探讨。正红菇（Russula vinosa）种群具有较高的遗传多样性，每个子实体来自不同的克隆。空间距离-遗传相似性关系和空间格局分析的结果均表明，这一正红菇的种群结构可能是由短距离孢子传播产生的，而不可能是无性生长或长距离孢子传播形成的。在对隐花青鹅膏菌（Amanita manginiana）连续两年的种群结构进行了研究中，种群的每一个子实体也均来自不同的克隆。遗传相似性分析、AMOVA、遗传相似性-空间距离关系的结果均显示，这两年的种群在遗传相似性和种群结构上均具有显著差异。对此的一个合理的解释就是，这一外生菌根真菌种群来说，其个体由有性孢子发育为子实体的时间可能超过一年，因而2001和2002年的个体并非同一种群的连续世代。 外生菌根真菌群落可以定义为在一定地理范围和时间尺度内不同外生菌根真菌种群的组合。对外生菌根真菌群落的研究有助于揭示森林生态系统中菌根真菌与植物、菌根真菌与环境因子、以及菌根真菌之间的相互关系。在第三章中，我们应用点格局的分析方法和二元逻辑回归分析对外生菌根真菌的主要类群，即鹅膏菌科，牛肝菌科和红菇科，的空间格局及其与周围（5×5米样方）树种组成的关系进行研究。结果表明，某些树种与特定类群菌根真菌的子实体出现有负相关，而三个类群的外生菌根真菌在克隆生长上的差异并不是子实体空间分布的决定因素。而在较小尺度上（450平方米样方）研究也表明，三个主要外生菌根真菌类群的空间分布为聚集半径不等的集群分布，并且其空间分布不依赖于木本植物的分布。外生菌根真菌主要类群在空间分布上具有相互抑制的特点，而抑制能力的大小可能与菌根真菌地下菌丝体的分布范围及连续性有关。 外生菌根真菌的盆栽接种实验通常用来验证菌根真菌-宿主植物的相互关系，不但有理论意义，也是大田实验和大规模生产应用的基础。第四章中进行了两个实验，对外生菌根真菌多样性与宿主植物生长的关系以及菌根真菌与植物之间竞争平衡的关系进行了初步研究。在外生菌根真菌多样性对马尾松生长影响实验中，菌根真菌接种并未显著促进马尾松幼苗的生长和生物量积累，不同的菌种与地上、地下生物量的积累存在不同（正或负）的相关关系。外生菌根真菌的多样性水平与马尾松幼苗的针叶数量存在显著的正相关，并且随接种时间的延长相关关系更为显著。外生菌根真菌多样性水平还与马尾松幼苗地下生物量的累积呈显著的正相关关系。在外生菌根真菌对三种植物的竞争平衡和共存的影响实验中，外生菌根真菌接种没有显著促进马尾松幼苗的生长，但对漆树和枹栎幼苗的生长有显著影响。外生菌根真菌接种能够在两个外生菌根真菌宿主植物竞争中降低枹栎对马尾松的优势，在马尾松和漆树的竞争中降低马尾松的优势，并促使枹栎与漆树（一个外生菌根真菌宿主和一个非宿主植物）的竞争处于不稳定状态。 本文首次通过生态学的角度对外生菌根真菌的物种多样性、种群结构、群落中的空间格局、以及外生菌根真菌与植物生长的关系进行了较为全面的研究。在大型真菌的多样性方面，菌根和木生真菌比例的引入可以完善森林生态系统的健康评价体系，而分子数据库的建立使对大型真菌尤其是外生菌根真菌多样性的长期监测成为可能;在种群遗传结构方面，本文验证了红菇属和鹅膏菌属克隆较小的特点，以及红菇属菌根真菌以短距离孢子传播为主的繁殖特性，并首次从生活史特点的角度解释菌根真菌的种群结构的年度差异;在菌根真菌群落的空间格局方面，本文首次应用二元逻辑回归和点格局分析的方法研究外生菌根真菌的空间分布及菌根真菌－植物关系，并发现三个类群的外生菌根真菌在子实体分布上具有相互排斥的特点;在控制实验中，本文首次研究了菌根真菌接种的多样性水平对宿主植物的影响，首次研究了外生菌根真菌接种对三个物种之间竞争与共存的影响。虽然这些研究在很多方面都仅得到初步的结果，但我们希望这些探索可以为今后对外生菌根真菌的生态学研究提供有益的启示。

古田山大样地木本植物根萌现状及优势种群根萌空间格局分析

　　已有研究表明，萌生现象对森林恢复和植被演替等生态过程中具有及其重要的意义，作为一种可以和种子繁殖“抗衡”的直接的再生方式，森林萌生更新已受到越来越多的关注。近年来萌生生态学的研究主要针对于萌生的生态功能如对个体生活史策略的影响、在植被演替中的作用、对物种多样性影响等方面，研究的切入点大多注重相关的环境因子、遗传因子或自然和人为干扰如砍伐、火烧、大风等引起的萌生现象，针对原始森林演替的研究相对较少，针对“长期动态监测样地”的萌生现象则更少。由于长期动态观测样地具有固定和长期观察的特有优点，这对物种共存、格局及维持机制、植被演替等生物多样性热点问题的研究带来了难得的机遇和条件。 我国是地球上亚热带常绿阔叶林分布面积最广，发育最为典型的区域，我国亚热带常绿阔叶林的生物多样性极高,仅次于热带雨林。目前对亚热带常绿阔叶林物种共存、分布格局、群落演替等的研究相对较少。参照美国史密森热带研究所的热带森林研究中心(Center for tropical forest science，CTFS)森林动态样地的操作规范，中国森林生物多样性研究网络在中国从南到北按主要森林类型建立了5块20～25hm2的森林大样地。作为中国森林生物多样性长期监测网络的重要组成部分，古田山样地分布着典型的中亚热带常绿阔叶林。本论文在24hm2古田山中亚热带常绿阔林长期监测样地调查的基础上，重点从古田山大样地木本植物根萌现状及优势种群根萌空间格局等方面进行具体分析，试图了解古田山大样地根萌植物的种类组成、个体大小、数量、地理区系成分特点等基础特征，同时选择大样地乔灌木层的优势树种，重点分析优势种群根萌的空间分布格局及其特点，以便加深了解优势物种根萌的种内、种间的共存关系，也将对优势植物根萌植物的分布和样地生境的关系作出有益尝试。本文最后通过比较优势物种的主干和根萌空间分布格局等方面的相关性进一步揭示根萌在群落组成中的地位和作用。本研究将为亚热带常绿阔叶林根萌植物的长期动态研究积累基础资料，对了解常绿阔叶林根萌植物现状以及空间分布格局等方面起到积极的探索意义，同时对揭示根萌现象在亚热带常绿阔叶林物种多样性维持机制中的地位和作用也将起到一定的推动作用。

Geostatistical analysis of chlorophyll a in freshwater ecosystems

Horizontal spatial patterns of chlorophyll a in Meiziya Reservoir, Hubei Province, China were analyzed once each month during May, June and July 1997. Two geostatistical techniques, semivariance and fractal analysis, were used to determine variation in chlorophyll a over the whole study area (isotropic) and in different directions (anisotropic). Both techniques provided useful information for detecting and assessing spatial pattern changes of chlorophyll a in freshwater environments. Based on our case study, the distribution of chlorophyll a shifted from aggregated to random distribution in the case of small rainfall event, and then returned to the aggregated distribution after a large rainfall event. On the other hand, the distribution of chlorophyll a became more heterogeneous or random in the direction of water flow (S-N direction) when rainfall events occurred, which was enhanced by rainfall intensity. In contrast, the influence of water flow on the spatial patterns was weak in the E-W direction, and thus the distribution of chlorophyll a remained aggregate with a moderate spatial heterogeneity.

黄土高原坡地表层土壤饱和导水率和水分含量空间变异特征

表层土壤水分含量和饱和导水率对深层土壤水分的动态的变化具有重要的决定作用。在黄土高原坡地(50m×360 m)范围内进行网格(10 m×10 m)取样,用地统计学方法研究表层(0~30 cm)土壤饱和导水率和水分含量的空间变异特征。结果表明:1)坡地表层土壤密度变化规律为坡下位大于坡上位,土壤饱和导水率变异系数为0.37,属于中等变异强度;2)饱和导水率和自然对数化的饱和导水率在360 m尺度内均不具备空间结构特征,是纯随机变量,线性有基台模型适用于描述表层土壤水分的分布特征,水分分布存在明显的块金效应,并且随滞后距离的增加半方差变大;3)饱和导水率和水分含量从坡上位到坡下位均呈现波浪式变化,饱和导水率大的采样点土壤水分含量低,反之则高。

长白山北坡土壤动物群落时空格局与动态研究

土壤动物区系是分解者食物网的重要组成部分，作为生态系统中重要组成成分的土壤动物在分解作用、养分循环和土壤肥力保持中起重要的调节作用。论文以长白山北坡森林生态系统土壤动物为研究对象，综合运用野外调查、室内分析和多元统计方法，对各植被带中土壤动物组成和动态、土壤线虫群落结构、土壤动物群落随海拔梯度变化、次生林演替过程中土壤动物群落变化等问题进行定量分析研究，旨在揭示土壤动物生态分布规律，为森林生态系统的研究和森林可持续发展提供基础材料。本研究结果表明：（1），获得的主要土壤动物分别隶属于7门、10纲、21个目；不同时期（1979、1995及2001-2002）针阔混交林、针叶林和岳桦林中土壤动物数量总的变化呈下降趋势。数量为优势类群和常见类群随季节变化而变化的基本规律是：大、中小型土壤动物个体数量从春季到夏季呈增加趋势，从夏季到秋季逐渐减少；不同地区、同一地带不同年份调查结果差异较大。（2）．获得的土壤线虫隶属于60个属，土壤含水率明显影响线虫密度及营养结构；土壤微域环境中的孔隙度是影响土壤线虫分布的一个重要因素；森林生态系统中土壤线虫的种、属数较为丰富。（3）各海拔群落间物种共有度，大多以相邻的群落共有度最高；群落间物种共有度大体趋势是随群落间海拔差的增大而减小。土壤动物沿海拔梯度分布可分为三部分：550-1350m、1450-2150m和2250-2650m。（4）．长白山次生林中土壤动物主要功能类群有腐食性土壤动物（70-80％）、植食性土壤动物（5-10％）和捕食性土壤动物（10-20％）。土壤动物在长白山次生林中演替过程可分为增长期、过渡期和稳定期3个阶段。