银杏复合经营对土壤碳、氮、磷和有机质的影响

以江苏东台林场银杏+小麦(G+W)、纯银杏(G)和纯小麦(W)经营模式为研究对象,对不同土层(0～5,≥5～15,≥15～30和≥30～50 cm)的pH、微生物量碳、微生物量氮、硝态氮和铵态氮、全氮、速效磷、全磷和有机质进行了系统的测定。结果表明:不同经营模式对土壤pH没有显著的影响,但对土壤微生物量碳、微生物量氮、硝态氮、全氮、速效磷、全磷和有机质等影响显著。G+W经营模式有较高的土壤微生物量碳、微生物量氮、硝态氮、全氮、速效磷、全磷和有机质。因此,银杏复合经营系统能够更好地维持土壤肥力,利于土地可持续经营。
Ginkgo(Ginkgo biloba )is a traditional economic tree species in China, and it is often cultivated by using agroforestry pattern. In order to understand the influences of ginkgo agroforestry on soil fertility, three planting systems, including pure ginkgo(G), ginkgo+wheat(G+W)and pure wheat(W)were selected, and pH, microbial biomass carbon, microbial biomass nitrogen, nitrate nitrogen, total nitrogen, available phosphorus, total phosphorus and organic matter in soil were determined. The results showed that no significant influence was presented on soil pH among different planting systems, but planting systems significantly influenced on microbial biomass carbon, microbial biomass nitrogen, nitrate nitrogen, total nitrogen, available phosphorus, total phosphorus and organic matter in soil. The G+W planting system exhi-bited higher microbial biomass carbon, microbial biomass nitrogen, nitrate nitrogen, total nitrogen, available phosphorus, total phosphorus and organic matter, indicating that ginkgo agroforestry systems could improve soil fertility and was in favour of land sustainable management