摘要
对18 a生初植密度为3 130株/hm2的油松人工林进行了35.7%,49.2%和64.2%共3种不同强度间伐及无间伐对照共4个处理。3 a后,对上述4个密度林分内0—20 cm土层土壤的理化性质及土壤酶活性进行了研究。结果显示,对18 a生油松林进行间伐可以提高林内土壤质量。随着间伐强度增大,林内土壤总孔隙度、毛管持水量明显升高,土壤有机质、速效钾、有效磷含量增加,过氧化氢酶、多酚氧化酶、脲酶以及碱性磷酸酶的活性增强。方差分析及多重比较结果表明,不同间伐强度对上述指标影响显著。主成分分析结果表明,土壤过氧化氢酶活性、脲酶活性和土壤有效磷含量可以作为土壤质量评价指标。随着保留密度降低,林内土壤质量综合评分依次为:-1.061,0.032,0.347和0.682。其中,保留密度为1 075株/hm2的油松幼龄林土壤综合评分最高。
In order to investigate the influences of thinning on soil quality in young Pinus tabulaeforrnis plantations and to provide a reference for reasonable thinning, a thinning experiment was conducted in the 18- year-old Pinus tabulaeforrnis plantation in lower hilly lands of Yingpan and Yanqing County, Beijing City. Four different thinning treatments （0, 35.7%, 49.2%, and 64.2% thinned） were carried out in the stands of 3130 tree/hm2 initial density. In 2005, the 3rd year after thinning, soil physical properties, chemical properties, and soil enzyme activities in the four sample plots were studied. Results showed that thinning has sig- nificant effects on soil quality in the 18-year-old Pinus tabulaeforrnis plantation. The thinning would improve capillary spaces and water-holding capacities. Along with the density decreasing, soil organic matter, available K, and available P increased significantly. The catalase, polyphenol oxidase, urease, and alkaline phosphatase activities increased along with the thinning increasing. Results from principle component analysis revealed that soil catalase, urease, and available P could be regarded as indicators to assess soil quality affected by thinning. In the plantations of decreased reserve density, the integrated fertility indexes of soil quality properties were --1. 061, 0. 032, 0. 347, and 0. 682, respectively, among which the 64.2% thinning intensity was the best.
出处
《水土保持通报》
CSCD
北大核心
2008年第3期65-70,共6页
Bulletin of Soil and Water Conservation
基金
国家自然科学基金(30471380)
北京市教委项目(JD100220648)
关键词
油松
间伐强度
土壤酶
土壤养分
Pinus tabulaeformis
thinning intensity
soil enzyme
soil nutrient
