日光温室豆科绿肥作物还田前后土壤生物活性差异特征初探

在日光温室单一种植体系中引入种植豆科绿肥,研究2种绿肥作物(黄豆、香豆子)还田前后土壤微生物量碳氮、微生物数量及土壤酶活性的变化特征。结果表明:在日光温室休闲期,种植黄豆和香豆子均能显著提高土壤纤维素酶、脲酶和蔗糖酶活性,与种植香豆子相比种植黄豆能产生较多的干物质量。绿肥还田后,虽然黄豆处理土壤酶活性低于香豆子处理,但土壤中微生物总量、细菌数量和比例及微生物量碳氮含量显著高于香豆子和对照,且微生物量C/N比例也较为适宜,因此黄豆可作为日光温室短期休闲绿肥还田作物。

Difference characteristics of soil bioactivities in greenhouse after returned green manure of leguminous plant to the field

In this study, two kinds of leguminous plant, soybean and trigonella foenum-graecum, were imported in monoculture greenhouse. The effects on soil microbial biomass N, microbial biomass C, soil microbial biomass, and soil enzyme activity were investigated before/after green manure returned to field. The results showed that in the fallow period of greenhouse, the enzyme activities of cellulase, urease, sucrase, significantly increased after planting soybean and trigonella foenum-graecum. Compared with planting trigonella foenum-graecum, the amount of dry matter was highter in soybean planted treatment. After green manure returned to field, the soil enzyme activities in soybean treatment were lower than those in trigonella foenum-graecum, but the soil microbial population, population and ratio of bacterial, soil microbial biomass N and C were significantly higher than those in trigonella foenum-graecum and control, and microbial biomass C/N was more optimum. In conclusion, soybean could be used as short-term green manure crop in greenhouse.