摘要
本项研究用径流小区的定位试验方法,收集了黄绵土坡地表土和在暴雨时产生的泥沙,测定和分析了它们的化学和生物学特性.结果表明:泥沙中15种对植物生育有重要作用的化学物质,与产沙区表土比较有11种达到显著的差异水准,4种无质的区别;泥沙中7种土壤酶活性,有3种显著高于表土,3种差异不明显,1种显著低于表土;泥沙中的酶之间以及酶与养分存在着一定的相关性.研究揭示了坡地水蚀的泥沙不是均匀的表层沙粒,而是一种粒径较小的土壤有机无机复合体;这种复合体含有大量的植物生育必需的化学营养物质和促进土壤肥力提高的酶类;水蚀对整个坡地土壤肥力损失极大.
The study employs the method of fixed-position test in runoff plots and analyses the biological and chemical characteristics of the collected sam- pies of yellow loamy so\l on the topsoil of slopes and sediment by rainstorm. The results are as fellows:The sediment contains fifteen kinds of chemical compositions which are very important nutrients for growth of plants. Compared with topsoil, eleven of them have obvious differences. There are also four kinds of chemical compositions which do not have qualitative differences. Except above, it also contains seven kinds of soil enzyme activities. In the seven kinds of soil enzyme activiries, compared with enzymes in topsoil, three of them have higher soil enzyme activities, three of them do not have obvious differences, and one of them has lower soil enzyme activities. There are some correlations among soil enzymes as well as between soil enzymes and nutrients. The study reveals that sediment from water erosion in slopes are not even silt in topsoil, but it is small organic-mineral soil complex which contains a large number of chemical nutrients for the growth of plants and soil enzymes enriching fertility. Under water erosion soil tertility will suffer heavy losses for all slopes.
出处
《泥沙研究》
CSCD
北大核心
1992年第1期30-35,共6页
Journal of Sediment Research
