文献类型：期刊文献

中文题名：雷竹林土壤和叶片N、P化学计量特征对林地覆盖的响应

英文题名：Responses of N and P stoichiometry on mulching management in the stand of Phyllostachys praecox

作者：郭子武[1] 陈双林[1] 杨清平[1] 李迎春[1]

第一作者：郭子武

机构：[1]中国林业科学研究院亚热带林业研究所

年份：2012

卷号：32

期号：20

起止页码：6361-6368

中文期刊名：生态学报

外文期刊名：Acta Ecologica Sinica

收录：CSTPCD;;Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2011_2012】；

基金：国家林业局林业科技推广项目([2011]02号);浙江省林业科技推广项目(2011B01);杭州市科研院所专项(20090332N01)

语种：中文

中文关键词：雷竹;林地覆盖;氮;磷;化学计量

外文关键词：Phyllostachys praecox; mulching of bamboo stand; nitrogen; phosphorus; stoichiometry

分类号：S644.2

摘要：为摸清林地覆盖集约经营对雷竹林土壤和叶片氮(Nitrogen,N)、磷(Phosphorus,P)化学计量特征的影响,揭示雷竹林退化机理,为退化雷竹林恢复提供理论依据,对不同林地覆盖年限(CK,3 a和6 a)雷竹林土壤和立竹叶片的N、P含量和N∶P变化规律进行了分析。结果表明:不同林地覆盖年限雷竹林土壤N、P含量均随土层深度的增大而降低,随着林地覆盖年限的增加,各土层土壤N、P含量均提高。林地覆盖雷竹林0—20 cm土层土壤N、P累积现象明显,N∶P显著提高;林地覆盖雷竹林不同年龄立竹叶片N、P含量均较不覆盖雷竹林有显著或极显著降低,叶片N∶P随林地覆盖年限的增加总体上呈显著升高趋势;立竹叶片N∶P与土壤P含量极显著正相关,与立竹叶片P含量和土壤N∶P极显著负相关,而与土壤和立竹叶片N含量相关性不显著。随林地覆盖年限的增加,雷竹林土壤和立竹叶片N、P间相关性均减弱;研究表明林地覆盖会明显改变雷竹林土壤和立竹叶片的N、P化学计量特征,引起N、P养分失衡,P素对雷竹林生长的限制性作用增强,会导致雷竹林退化。
To approach the impact of intensive and mulching management on nitrogen（N） and phosphorus（P） concentration and the ratio of N ∶P in soil and bamboo leaf,and clarify the degradation mechanism of Phyllostachys praecox plantation,the concentration of N and P elements in soil and leaf of Ph.praecox as well as its stoichiometry from bamboo stand with different mulching management treatments（6a,3a and CK） were analyzed,and this research will provide theoretical guidence for regeneration of degraded bamboo plantations.The results showed that with soil depth increasing,soil N,P concentration among soil layers decreased.While with the time of mulching management extending,the concentration of N and P in soils increased significantly,and the ratio of N ∶P in soil 0—20cm increased significantly for mulching management stands;and N,P contents were enriched in 0—20cm soil layers.However N decreased significantly in leaf and P decreased much significantly for leaf in stands of 3a and 6a.The ratio of N ∶P was 14.05—18.39 in Ph.praecox leaves,and increased in 3a and 6a,which indicated that the function of P as key factor to limit the growth was enhanced.Furthermore the ratio of N ∶P in leaves had positive significant correlation with soil P content,and was negatively significant correlation with soil N ∶P ratio and P content in leaves,but had no significant correlation with soil N concentration.Thus it was concluded that with the time of mulching management extending,the coefficient between soil N and soil P,and the coefficient between leaf N and leaf P both decreased.The changes of soil N,P stoichiometry were caused by long-term mulching management which led to enhance the function of P as limit factor,make imbalance of the relationship between N and P,and inhibit absorption of N and P by bamboo leaf,which might be the main reason causing bamboo plantation degradation.