干旱、半干旱区约占全球陆地表面的41%（Reynolds et al.,2007）,是陆地生态系统的重要组成部分。但是,由于干旱荒漠地区土壤水分含量低,而且降水稀少,因此不能支撑大面积、连续分布的植被（Schulze et al.,2005）,植物群落通常较为单一...
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干旱、半干旱区约占全球陆地表面的41%（Reynolds et al.,2007）,是陆地生态系统的重要组成部分。但是,由于干旱荒漠地区土壤水分含量低,而且降水稀少,因此不能支撑大面积、连续分布的植被（Schulze et al.,2005）,植物群落通常较为单一,不同类型灌木的斑块状分布格局是荒漠区植被的显著特征（Whitford,2002）。昆虫多样性是全球生物多样性的重要组成部分（Lewinsohn et al.,2008）,而其中的荒漠昆虫是随着荒漠的出现,适应环境改变演化而来的一支特殊旱生昆虫类群（黄人鑫等,2005）,是荒漠生态系统的重要组成部分。
Soil samples were collected to a depth of 20 cm using a 3.0 m × 3.0 m grid in 900 m 2(30.0 m ×30.0 m) plots for analysis of spatial patterns of soil in undisturbed area of China fir(Cunninghamia lanceolata) ...
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Soil samples were collected to a depth of 20 cm using a 3.0 m × 3.0 m grid in 900 m 2(30.0 m ×30.0 m) plots for analysis of spatial patterns of soil in undisturbed area of China fir(Cunninghamia lanceolata) and Masson pine(Pinus massoniana) mixed forest in the Three Gorger Reservoir *** investigation data showed that the average of soil DNA content was 922.71 μg·g-1 water-free soil,the maximal value was 6 761.30 μg·g-1 water-free soil,and the less value 58.52 μg·g-1 water-free *** geostatistical analysis indicated that the spatial distribution characteristic was not obviously reflected by the liner graphs while samples were randomly distribution and independent each *** separation distance among samples was related to precision of soil DNA content,the effects of non-structure factors(environment factors,disturbed factors) on spatial correlation structure would disappeared due to the separation distance in excess of 18.84 m,and the spatial correlation of soil DNA faded down in *** variability in soil DNA in the region was mostly contributed by the influencing factors including soil nitrogen,soil organic matter and content of soil water.
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