生态学杂志2013，Vol.32Issue(2)：285-291,7.
祁连山地甘肃臭草斑块土壤水分与植被盖度空间格局
Spatial patterns of soil moisture and vegetation coverage in Melica przewalskyi patches in degraded alpine grassland of Qilian Mountains, Northwest China
摘要
Abstract
Soil moisture is the key factor in the formation and evolution of vegetation pattern. The spatial heterogeneity of soil moisture has an important significance in understanding the response mechanisms of plants in arid grasslands to environment. Meanwhile, at small scales, vegetation condition is the important driving factor to the spatial heterogeneity of soil moisture. By the meth-ods of geo-statistics, this paper studied the spatial variability of surface soil (0-30 cm) moisture content and vegetation coverage as well as their relationship in the Melica przewalskyi-dominant patches in degraded grassland on the northern slope of Qilian Mountains, Northwest China. In the M. przewalskyi -dominant patches, both the surface soil moisture content and the vegetation coverage were in line with normal distribution. In different layers at 0-30 cm depth, soil mois-ture content had a high degree of spatial heterogeneity, and 80. 93% -87. 34% of the heterogene-ity was caused by spatial autocorrelation. The spatial autocorrelation in vegetation coverage was found within the distance from 4. 09-6.91 m, whereas the spatial heterogeneity of vegetation cov-erage caused by stochastic factors at <1 m scale accounted for 12. 66% -19. 07%. The spatial heterogeneity of soil moisture content in M. przewalskyi-dominanl patches showed an obviously layered and patchy structure, and the high and low moisture values had a mosaic distribution. Through physiological integration, M. przewalskyi affected, and in definite extent, altered the spatial distribution of soil moisture at small scales, and thus, achieved the maximum utilization of soil water resource, and improved the adaptability and competitiveness of M. przewalskyi popula-tions in arid habitats.关键词
甘肃臭草/土壤水分/植被盖度/地统计学/空间格局/祁连山地Key words
Melica przewalskyi/soil moisture/vegetation coverage/geo-statistics/spatial pat-tern/Qilian Mountains分类
农业科技引用本文复制引用
史丽丽,赵成章,樊洁平,张静,张军霞..祁连山地甘肃臭草斑块土壤水分与植被盖度空间格局[J].生态学杂志,2013,32(2):285-291,7.基金项目
国家自然科学基金项目(91125014和40971039)、甘肃省科技支撑计划项目(1011FKCA157)和甘肃省生态经济重点学科项目资助. （91125014和40971039）
