杉木采伐迹地清理方式对土壤理化性质的影响

Effect of Clear Cutting Clearances on Soil Physicochemical Properties of Cunninghamia lanceolata Stand

研究了杉木林采伐迹地及采伐后的炼山迹地的土壤肥力。结果表明:炼山迹地土壤容重最大,比杉木林地高13.5%,非炼山迹地比杉木林地高5.9%;不同处理非毛管孔隙差异显著,炼山迹地非毛管孔隙最小,比杉木林小105.45%,非炼山迹地非毛管孔隙比杉木林小37.1%;杉木采伐后,酸性降低;有机质也明显下降,非炼山迹地比杉木林低29.1%,炼山迹地比杉木林地低119.22%;非炼山迹地和炼山迹地全N含量分别比杉木林下降了23.07%、33.33%,全P含量分别下降了64.16%、76.19%,全K含量分别下降了10.86%、32.74%;非炼山迹地比杉木林地下降了22.69%,炼山迹地比杉木林地下降了34.05%;杉木采伐后,非炼山迹地速效P和速效K含量分别比杉木林地下降了15.43%、36.79%;炼山迹地速效P和速效K含量分别比杉木林地下降53.27%、71.32%。

Soil fertility of Cunninghamia lanceolata in clearing cutting and controlled burning land were studied. Result shows that the soil bulk density in controlled burning land is 13.5% higher than that in C.lanceolata planta-tion,non-controlled burning land is 5.9% higher than that in C.lanceolata plantation;differences of non-capillary porosity with different treatments are significant,non-capillary porosity of burning slash ,which is the most least,is 105.45% smaller than that of C.lanceolata;noncapillary porosity of non burning slash is 37.1% than that of C. lanceolata ;acid of soil was reduced after C.lanceolata being harvested;organic matter also decreased significantly, organic matter of non-controlled burning land is 29.1% lower than that in C.lanceolata plantation,organic matter in burning area is 1 1 9.22% lower than that in C.lanceolata;total N content in non-controlled burning land and controlled burning land is decreased by 23.07%,33.33%,respectively than that in C.lanceolata plantation;the total P content decreased by 64.1 6%,76.1 9%,the total K content decreased by 10.86%,32.74%;the content of N for non-controlled burning land was 22.69% lower than that in C.lanceolata plantation,the content of N for controlled burning land was 34.05% lower than that in C.lanceolata forest;after C.lanceolata being harvested, the content of available P & K in non-controlled burning land decreased by 1 5.43%,36.79% than that in C.lan-ceolata plantation;the content of available P & K decreased by 53.27%,71.32% than that in C.lanceolata planta-tion.