巨尾桉人工林下种植小叶锦鸡儿对土壤质量的影响研究

Effect of Interplanting Caragana microphylla in Eucalyptusgrandis x E.urophylla Plantation on Soil Quality

2017年5月,对福建省福安市不同土地利用类型(撂荒地、5年生巨尾桉Eucalyptus grandis×E.urophylla人工林、巨尾桉人工林+小叶锦鸡儿3种Caragana microphylla林)土壤的理化性质进行分析,利用土壤退化指数(SDI)评价样地土壤质量。结果表明,0~30 cm的土壤容重:撂荒地>巨尾桉人工林>巨尾桉人工林+小叶锦鸡儿,总孔隙度:桉树人工林+小叶锦鸡儿>巨尾桉人工林>撂荒地,含水量、有机碳、全氮、碱解氮、有效磷和速效钾含量:巨尾桉人工林+小叶锦鸡儿>撂荒地>巨尾桉人工林;SDI:巨尾桉人工林+小叶锦鸡儿(0.167)>撂荒地(0)>巨尾桉人工林(-0.130)。因此巨尾桉林地土壤质量不同程度的退化情况,可以通过在巨尾桉人工林下种植小叶锦鸡儿修复土壤,提高土壤质量。

Determinations were carried out on soil physio-chemical properties of different land use types, such as abandoned land （A）, pure 5-year Eucalyptus grandis × E. urophylla plantation （B） and E. grandis × E. urophylla interplanted with Caragana microphylla （C） in Fu’an, Fujian province in 2017. Soil quality was evaluated by soil degradation index. The results showed that the soil bulk density at 0 - 30 cm soil layer of tested sample plots was ordered by A〉 B〉 C, total porosity by C〉 B〉A, pH, water content, organic carbon, total nitrogen, available nitrogen, available phosphorus and available potassium content by C 〉A 〉B. The SDI was C （0.167） 〉 （0） 〉B（-0.13）. The experiment concluded that pure E. grandis × E. urophylla plantation had the worse soil quality in the tested 3 land types. Interplanting of C. microphylla could restore and improve soil quality.