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经杉木连栽与头栽林地13对配对样地的研究表明,连载林分直径、树高、密度和蓄积量明显下降,地位指数平均下降2.41。由于连栽,引起0～40cm土层的土壤容重增加2.22%,毛管孔隙、毛管含水量、田间持水量和自然含水量分别下降2.61、6.45、9.15和9.57%;土壤pH值增加5.77%,全N、有效P、速效K和有机质分别下降8.16、7.25、21.41和16.26%;土壤微生物数量和呼吸强度分别下降30.21和37.94%;连载林地植被常见有檵木、映山红等旱生灌木和酢酱草、一年蓬等旱地草本。研究认为,提高林地土壤有机质含量和减轻经营强度是改善连栽林地质量、恢复地力的可行途径。
The study on 13 paired plot plots of continuous plantations of Cunninghamia lanceolata and cephalopods indicated that the diameter, tree height, density and volume of serial plantations decreased obviously, and the average position index decreased 2.41. The soil bulk density of 0-40cm soil layer increased 2.22% due to continuous planting, the capillary porosity, capillary water content, field water content and natural water content decreased by 2.61, 6.45, 9.15 and 9.57% respectively; the soil pH value increased 5.77% N, available P, available K and organic matter decreased by 8.16, 7.25, 21.41 and 16.26%, respectively. The number of soil microbes and respiration intensity decreased by 30.21 and 37.94% respectively. Year Peng and other dry herbs. The study suggests that improving soil organic matter content and reducing operating intensity in forestland are feasible ways to improve the quality of continuous plantation and restore soil fertility.