论文部分内容阅读
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。
In the three experimental forests of Phyllostachys pubescens Mazel ex H.de Lehaie in Zhejiang and Jiangxi Provinces, the nutrient inputs of precipitation in Phyllostachys heterocycla cv. Pubescens forest and the nutrient output of the shoal flow in the small watershed for four years Observational study. The results showed that the seasonal variation of nutrient concentration and input in forest precipitation was significant, and was closely related to the seasonal variation of precipitation in the forest. The concentrations and inputs of nutrients in forest precipitation were listed as K ~ +> Ca ~ (2 +)> Mg ~ (2 +)> NH_4 ~ + -N> NO_3 ~ --N> PO_4 ~ -).季 The seasonal variation of nutrient nutrient output in runoff was in accordance with the trend of seasonal increase and decrease of water flow rate. The order of nutrient concentration and output was K ~ + Mg ~ (2 +)> available N> PO_4 ~ (3- ). In addition to the forest as a carrier of nutrient movement and water, bamboo hair growth and development characteristics, soil biological activities and fertilization, tending and other human measures also have an impact on the bamboo plantation ecosystem input and output of nutrients. In this paper, the GM (1,1) prediction model of annual input of nutrient elemental K in precipitation in the experimental forest of Miaoshanwu of Zhejiang Province was established.