为了解马尾松培育过程中磷的归还与释放规律,提高马尾松人工林的经营管理水平,对12年生马尾松人工林磷的归还与释放规律进行了研究.结果表明:磷与凋落物的归还呈极显著正相关,马尾松林一年四季均有归还,但主要归还物(凋落物)仍与马尾松生长对低温的响应相关联,每年11月磷归还量约占全年归还量的20％；在1200株/hm2、1767株/hm2和2167株/hm2 3种密度下,1年中磷的释放量为总磷量的29.32％、34.06％和33.74％,磷的释放规律与马尾松生长间存在明显相关,即在生长停滞期,分解释放量最大,而此时是马尾松根系积累磷的主要时期,在马尾松快速生长季节磷的需求反而下降,导致凋落物磷的释放呈正负交替相关.%The phosphorous return and release regulation of Masson pine plantation with 12 years old were studied to improve management and administrative level of Masson pine plantation. The results show that there is a very significant positive correlation between P return and litter, main litter is related to low temperature during growth period of Masson pine, P return amount in November accounts for 20% of annual P return amount, annual P release amount of Masson pine forest under three densities (1200 plants/hnvM 767plants/hm2 and 2 167plants/hm2) is 29. 32%, 34. 06% and 33. 74% of total P amount separately, there is obvious correlation between P release regulation and growth of Masson pine, P release amount reaches maximum when Masson pine is during the growth stagnant period, but P accumulation of Masson pine roots occurs during the growth stagnant period mainly and P requirement of Masson pine reduces during the rapid growth period, which results in positive and negative alternate correlation in P release of litter.
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