马占相思人工林生态系统养分积累与分配

通过对8年生马占相恩人工林生态系统养分积累与分配的研究，结果表明：林地土壤0-50cm土层内全c积累量为69090kg·hm^-2，全N积累量为3725kg·hm^-2，全P积累量为647kg·hm^-2，交换性K积累量为648kg·hm^-2，交换性Ca积累量为987kg·hm^-2，交换性Mg积累量为63kg·hm^-2；凋落物养分积累量N为58．764kg·hm^-2·a^-1，P积累量为1．608kg·hm^-2·a^-1，K积累量为9．021kg·hm^-2·a^-1，Ca积累量为22．898kg·hm-2·a^-1，Mg积累量为4．079kg·hm^-2·a^-1；人工林林分各元素积累量N为277．04kg·hm^-2、P为7．72kg·hm^-2、K为57．21kg·hm^-2、Ca为93．22kg·hm^-2、Mg为10．24kg·hm^-2；林下植被养分积累量N、P、K、Ca、Mg分别为35．40、2．67、29．47、22．38、4．00kg·hm^-2。

Ecosystem Nutrient Accumulation and Distribution of Acacia mangium Plantation

Ecosystem nutrient accumulation and distribution of 8-year-old Acacia mangium plantation were studied.Result shows that :accumulation of total C in soil layer of 0-50 cm is 69 090 kg·hm-2;accumlation of total N is 3 725 kg·hm-2;accumlation of total P is 647 kg·hm-2;accumulation of exchangeable K is 648 kg·hm-2;accumlation of exchangeable Ca is 987 kg·hm-2;accumulation of exchangeable Mg is 63 kg·hm-2;litter nutrient accumulation of N is 58.764 kg·hm-2·a-1;accumulation of P is 1.608 kg·hm-2·a-1;accumulation of K is 9.021 kg·hm-2·a-1;accumulation of Ca is 22.898 kg·hm-2·a-1;accumulation of Mg is 4.079 kg·hm-2·a-1;N,P,K,Ca,Mg(amount of each element of plantation stand) is 277.04,7.72,57.21,93.22,10.24 kg·hm-2,respectively;N,P,K,Ca,Mg(amount of nutrient accumulation of undergrowth vegetation)is 35.40,2.67,29.47,22.38,4.00 kg·hm-2 respectively.