摘要
对1983年通过不同改良措施(播种羊草、耙地、围栏封育)处理过的退化羊草草原群落特征进行比较研究,结果表明:虽然经过23 a的恢复,土壤条件仍有差别,经过耙地处理土壤容重最小,含水量最高;三种改良措施的增产效果都很明显,播种羊草、耙地、围栏封育的群落地上生物量比围栏外分别提高了127.30%、146.64%、138.04%;播种羊草和耙地处理的根茎禾草所占比例较高,而围栏外和围栏封育处理的丛生禾草所占的比例较高;三种改良措施中,旱生植物的绝对生物量都低于围栏外;耙地处理后群落多样性最高,而围栏外均匀性指数最高。综上所述:经过耙地改良所产生的效果维持时间最长,而播种羊草和围栏封育改良的后效依然存在。
Study on comparison of community characteristics of degenerated Leymus chinensis steppe treated respectively by different improving measures such as adding seeding Leymus chinensis,harrowing,and fencing from grazing in 1983 was conducted.The results showed that their soil conditions are different although after 23 years restoration： the soil bulk density is the least and the moisture content is the highest after harrowing;the yield increasing effect of the three measures all are remarkable： compared with the CK,the community biomass after reseeding Leymus chinensis,harrowing and fencing are increased by 127.30%,146.64%,138.04%,respectively;the rhizome grasses take a large percent in the community after reseeding Leymus chinensis or harrowing,whereas the bunch grasses take a large percent in the fenced or outside fencing;among the three treatment measures,the harrowing produces the highest diversity index;community outside the fence has the highest evenness index.In conclusion,the effect of harrowing last the longest time,and that of the other two measures still exist.
出处
《中国沙漠》
CSCD
北大核心
2008年第2期312-317,共6页
Journal of Desert Research
基金
国家重点基础研究发展计划基金(2007CB106807)
国家自然科学基金(30460086)资助
关键词
退化羊草草原
改良措施
功能群组成
多样性指数
degenerated Leymus chinensis steppe
improving measures
functional group composition
diversity index
