摘要
选择科尔沁沙地沙漠化严重地区相邻地段的固定沙丘、半固定沙丘、半流动沙丘和流动沙丘为对象,对土地沙漠化过程中植物种类消长、物种多样性、生活型结构及土壤理化性质和生物活性的变化特征进行了分析。结果表明:沙漠化过程是一个物种多样性衰减的过程,沙漠化导致大多数原生性物种消失。从生活型来看,地面芽植物受沙漠化影响最大。沙漠化过程中土壤养分严重丧失,土壤微生物量C、N、P,以及土壤脲酶、蛋白酶、蔗糖酶、磷酸单酯酶、脱氢酶和硝酸还原酶的活性均随沙漠化程度的加剧而大幅度下降。土壤生物活性对土壤沙漠化比较敏感,在固定沙丘到半固定沙丘的转化过程中土壤生物活性和物种多样性下降最快。
The objective of this study was to determine the characteristics of changes of species composition, species diversity, spectra of plant life - form, physical - chemical and biological properties of soil in the process of desertification of Horqin Sandy Land by taking adjacent fixed sand dune, semi - fixed sand dune, semi - moving sand dune and moving sand dune as treatments. The results showed that desertification was a process of biodiversity loss, and most original species were wiped out in the process. Change in life- form composition indicated that hemicryptophytes were severe affected by desertification. With the heavy losses of soil nutrient contents, the activities of urease, protease, saccharase, phosphataese, dehydrogenase and nitrate reductase decreased significantly in the process of desertification. Soil biological activity is very sensitive to desertification and the highest of the decrease of soil biological properties and species diversity were in the phrase from fixed sand dune -fixed sand dune.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2008年第10期156-161,共6页
Journal of Arid Land Resources and Environment
基金
国家"十一五"科技支撑计划课题"科尔沁沙地植被恢复及调控技术研究与示范"(2006BAD26B0401)资助
关键词
科尔沁沙地
沙漠化
植被退化
土壤理化性质
土壤酶
Horqin of soil
Sandy speeds to semi Land
desertification
vegetation degradation
phyasical and chemical properties soil enzyme
