子午岭不同植被类型土壤微生物量与有机酸含量

Studies on soil micro biomass and organic acid under different vegetations

以黄土丘陵沟壑区的子午岭次生林区为研究区域,分析了农田、草本、乔木、灌木、弃耕地五种不同植被覆盖下土壤微生物量与有机酸含量变化。结果表明,不同植被类型土壤微生物生物量C变化趋势是:农田>草本>乔木>弃耕地>灌木,从乔木到农田微生物生物量N、P基本上呈下降趋势。不同植被类型下土壤有机酸变化基本趋势为:弃耕地<灌木<草本<农田<乔木。相关分析表明,不同植被覆盖下土壤微生量C、P与该土壤有机酸含量呈显著正相关,而土壤微生物N与该土壤有机酸含量相关性不显著。

Based on the secondary forest at Ziwuling in typical hilly-gully regions on the Loess Plateau, the soil micro biomass and organic acid under different vegetation type were studied. The results showed that the soil micro biomass C was in the following order： farmland 〉 grassland 〉 arbor 〉 abandoned field 〉 bush. There were downtrends in micro biomass N,P from arbor to farmland. Under different vegetation type, the content of soil organic acid was basically in the order of arbor 〉 farmland 〉 grassland 〉 bush 〉 abandoned land. Correlation analysis indicated that there were positive correlations between soil microbial biomass N,P and organic acid, and a rather weak correlation between soil microbial biomass N and organic acid.