武夷山甜槠群落氮、磷的累积循环

Accumulation and Biological Cycle of N and P Elements in Castanopsis eyrei in Wuyi Mountains

讨论了中亚热带武夷山先峰岭５１龄甜槠Ｃａｓｔａｎｏｐｓｉｓｅｙｒｅｉ（Ｃｈａｍｐ．ｅｘＢｅｎｔｈ．）Ｔｕｔｃｈ．群落的氮、磷元素的累积和循环．测定结果表明：群落现存量中含有的氮、磷总量分别为１５５．５４９ｇ／ｍ２和５．５３５ｇ／ｍ２，其中地上部分别为１２７．１１７ｇ／ｍ２和４．４６３ｇ／ｍ２；地下部分别为２８．４３２ｇ／ｍ２和１．０７２ｇ／ｍ２．甜槠群落氮、磷元素的生物循环中，年吸收量分别为９．４５８ｇ／ｍ２．ａ和０．４３４ｇ／ｍ２．ａ，存留量分别为４．４８８ｇ／ｍ２．ａ和０．１９９ｇ／ｍ２．ａ，归还量分别为４．９７０ｇ／ｍ２．ａ和０．２３５ｇ／ｍ２．ａ．它们的氮含量均大小磷含量，周转期氮４３年，磷４０年。

This paper deals mainly with the accumulation and biological cycle of N and P elements of 51 year old Castanopsis eyrei community in Xianfengling in Wuyi Mountains.The main results of the measurement were as follows :1)The amounts of N and P in the standing crop of this community were 155.549 g/m 2 and 5.535 g/m 2,in which the amounts of the two elements in the biomass of aboveground were 127.117 g/m 2 for N and 4.463 g/m 2 for P,and in the biomass of underground were 28.432 g/m 2 for N and 1.072 g/m 2 for P,respectively.2) In biological cycle of N and P of this stand ,the annual values of the vegetation mineral uptake were 9.458 g/m 2·a for N and 0.434 g/m 2·a for P,of its retention were 4.488 g/m 2·a for N and 0.199 g/m 2·a for P ,and its return were 4.970 g/m 2·a for N and 0.235 g/m 2·a for P respectively . 3) The turnover periods of P and P were 43 and 40 years respectively.