竹林养分循环 Ⅱ.毛竹林内降水的养分输入及其林地迳流的养分输出  

Nutrient Cycling in Bamboo Stands II . Nutrient Input with Throughfall and Its Loss Through the Run-Off of the Watershed in Pure Phyllostachys pubescens Stands

作　　者：傅懋毅[1] 曹群根[1] 方敏瑜[1] 谢锦忠[1] 

机构地区：[1]中国林业科学研究院亚热带林业研究所

出　　处：《林业科学研究》1992年第5期497-505,共9页Forest Research

基　　金：加拿大国际发展研究中心(IDRC)资助

摘　　要：在我国亚热带毛竹(Phyllostachys pubescens Mazel ex H.de Lehaie)主要产区浙、赣两省的三块试验林中对毛竹林内降水的养分输入及其小流域迳流的养分输出进行了连续四年的观察研究。结果表明,林内降水中的养分物质浓度及其输入量的季节变化明显,且与林内降水量的季节变化密切相关。林内降水中各养分物质的浓度及输入量依大小顺序列为K^+>Ca^(2+)>Mg^(2+)>NH_4^+-N>NO_3^--N>PO_4^(3-)。迳流水养分输出量的季节变化动态与迳流水量的季节增减趋势相一致,其养分物质浓度及输出量高低顺序为K^+>Mg^(2+)>速效N>PO_4^(3-)。除作为养分移动载体的林内降水及迳流水外,毛竹生长发育特性、土壤生物活动及施肥、抚育等人力措施亦对毛竹林生态系统的养分输入与输出产生影响。文中建立了浙江省庙山坞试验林林内降水中养分元素钾的年输入量GM(1,1)预测模型。Nutrient input from throughfall and its loss through the runoff of three small watersheds covered by Phyllostachys pubescent stands were monitered for study on nutrient cycling in southern China during the period from 1986 to 1989. Results indicate that the concentration and the amount of nutrients from throughfall are close relative to the throughfall amount, and show an obvious seasonal variation. The relative abundance of nutrient from throughfall is K+>Ca2+>Mg2+>NH/-N>NO3--N>PO43-. The dynamics of the amount of nutrients lost through the run-off in the small watershed correspond to the seasonal variation of the run-off amount. The relative abundance of nutrients of run-off is K+>Mg2+>NH4+ -N plus NO3--N>PO43-. Besides the amount of throughfall and run-off, the bamboo growth character, soil microbial activity and human being measures are the main factors which affect the inputs and outputs of nutrients in a bamboo ecosystem. The GM (1,1) model for predicting the K input amount with throughfall in a year at Miaoshanwu experimental site has been established.

关 键 词：竹林 养分 毛竹林 林地迳流 

分 类 号：S795[农业科学—林木遗传育种]