不同土壤水库营建措施对红壤果园土壤团聚体特征的影响(英文)

Impact of soil reservoir construction measures on soil aggregates characteristics in red soil orchard

采用野外调查与室内分析相结合的方法,对不同土壤水库营建措施下红壤果园的土壤水分物理性质、土壤团聚体及稳定性进行了研究.试验结果表明:(1)不同土壤水库营建措施果园土壤容重出现不同程度的减小,其中以施用多量有机质肥的果园变化最为明显;对照总孔隙度与采取营建措施果园的无明显差异,但整个土壤剖面上其非毛管孔隙显著低小.(2)在干筛处理下土壤团聚体以>2mm粒径为主,总体呈现出随粒径的加大先增加后降低再增加的趋势;而在湿筛处理下土壤团聚体以<0.25mm粒径为主,呈现出随着粒径的增大而减少的趋势.(3)不同土壤水库营建措施果园的土壤团聚体破坏率,总体上呈现多量有机质肥<少量有机质肥<稻草覆盖<清耕<对照的趋势.

The physical properties of soil moisture and the stabilities of soil aggregates have been studied through field investi- gation and laboratory analysis. The results show that： （ 1 ） Soil bulk density decreases differently under different soil reservoir construction measures,in which the orchard tO which large amounts of organic fertilizer has been applied changes obviously. No significant difference appears in total porosity between the CK and the orchard constructed by different measures, but non- capillary porosity of the former is significantly low throughout the whole soil profile. （2） Under dry sieving, most soil aggre- gates are 〉2 ram,and their amounts decrease at the beginning,then increase,and decrease at last with the increase of their diameters; while under wet sieving, most soil aggregates are 〈 0.25 ram, and their amounts decrease with the increase of their sizes. （ 3 ） The damage rate of soil aggregates in different soil reservoir construction measures shows the tendency that large amounts of organic fertilizer 〈 small amounts of organic fertilizer 〈 straw mulching 〈 clean tillage 〈 the CK.