水保措施对油桃园土壤有机碳库及其组分的影响

Effects of Different Soil Conservation Measures on Soil Organic Carbon Pools in Nectarine Orchard

以福建尤溪玉池果园水土流失定位观测点为平台,研究了不同水保工程措施对油桃园土壤有机碳及其组分的影响。结果表明,梯台清耕和梯台生草模式油桃园土壤有机碳密度较顺坡清耕模式分别提高18.3%和34.7%。梯台生草模式土壤有机碳含量分别比顺坡清耕和梯台清耕模式提高15.3%和46.5%,颗粒有机碳、轻组有机碳、可溶性有机碳和微生物量碳含量分别提高了17.6%和30.9%、60.4%和112.7%、6.5%和24.3%、42.2%和45.3%,说明生草栽培措施有利于改良果园土壤结构,提高土壤肥力。梯台生草模式土壤惰性有机碳含量也比顺坡清耕和梯台清耕模式分别提高39.1%和39.0%,说明生草栽培也可促进果园土壤稳定性碳库的增加。

Soil organic carbon（C）is greatly influenced by soil management practices. Here we compared the effects of different soil conservation measures on soil organic C fractions in nectarine orchard. There were three soil management practices：slope plus clean tillage（T1）,terrace plus clean tillage（T2）and terrace plus sod culture（Arachis pintoi mulching）（T3）. Soil organic C content in T3 orchard was 46.5%higher than in T1 and 15.3% higher than in T2. Compared with T1,the contents of particulate organic C（POC）,light fraction of organic C（LFOC）,dissolved organic C（DOC）and microbial biomass C（MBC）increased by 17.6%,60.4%,6.5%and 42.2% in T2orchard,and30.9%,112.7%,24.3% and 45.3% in T3,respectively. Resistant organic C content in T3 was over 39% greater than in T1 or T2. Our results show that sod culture would increase soil organic C and improve soil fertility.