摘要
通过对扁穗牛鞭草在不施肥条件下的生物量、生长因子以及对土壤pH值、有机质、全量元素、水解N、有效P和速效K等测定,了解生长状况及其对土壤养分的影响。结果表明:随着时间增加,生物量显著降低,年均下降50.41%。株高和茎粗表现不同程度的下降,茎长有升有降。而密度增加,年均上升13.74%。土壤pH略有下降,表层土壤有机质、全量元素、水解N、有效P和速效K均表现不同程度的降低,其中水解N、有效P和速效K等土壤有效养分降幅明显,年均分别下降26.73%,23.71%和7.31%,引起地力衰退,供肥力降低,导致生产力下降。
A research into growth status of Hemarthria cornpressa and its influence on soil nutrients was performed through the measured： data of biomass,growth factors, soil pH value, soil organic matter, total N, P, K, hydrolysable N, available P and K without fertilizing the experimental fields in Sichuan Agricultural University from 2004 to 2005. The results indicated that the biomass reduced greatly （50.410% per year） with the pass of time and the growth of height and diameter decreased in a certain degree whereas the plant density increased by 13.74% per year and that the soil pH value lowered slightly and soil organic matter, dissolved N, available P and K decreased in various degrees. Among them, hydrolysable N, available P and K decreased 26.73%, 23.71 % and 7.31% respectively each year, but the bottom layer of soil was not obviously affected by them. The ability of soil fertility supplying declined,which affected productivity of Hemarthria compressa growth directly.
出处
《水土保持研究》
CSCD
北大核心
2008年第2期120-123,共4页
Research of Soil and Water Conservation
基金
国家科技部“十五”重大科技攻关项目(2001BA606A-06)
