福建武夷山黄山松群落的氮、磷累积和循环

ACCUMULATION AND BIOLOGICAL CYCLE OF NITROGEN AND PHOSPHORUS IN PINUS TAIWANENSIS COMMUNITY IN WUYI MOUNTAINS

摘要:

本文是福建武夷山森林生态系统研究的一部分，主要讨论黄山松（Pinustaiwanensis）群落的氮磷累积和循环。测定结果表明：（1）群落现存量中氮（N）、磷（P）的库量分别为925．844kghm-2和45．981kghm-2，其中地上部分别为719．438kghm-2（占总库量的77．706%）和35．534kghm-2占77.280％），地下部分别为206．406kghm-2（占22．294％）和10．447kghm-2（占22.720％）；（2）N、P的生物循环中，年吸收量分别为65．344kghm-2和2627kghm-2，年存留量分别为37．019kghm-2和1．695kghm-2，年归还量分别为28．325kghm-2和0.932kghm-2；（3）氮、磷的富集率分别为1．324和1．083两者均大于1，说明该群落对N、P仍在不断累积。

Abstract:

The accumulation and biological cycle of N and P nutrients in Pinus taiwanensiscommunity in Wuyi mountains, Fujian Province, were studied. The results were as follows: 1) The amounts of N and P in the standing crop of this community were 925.844 kg hm2 and 45.981 kg hm-2, respectively, in which the amounts of the two nutrients in the above- ground biomass were 719.438 kg hm2 for N and 35.534 kg hm2 for P, and in the underground biomass were 206.406 kg hm2 for N and 10.447 kg hm2 for P. 2) In biological cycle of N and P of this stand, the annual vegetation mineral uptakes amounted to 65.344 kg hm2 and 2.627 kg hm-2, respectively. The retention of N and P were 37.019 kg hm2 and 1.695 kg hm-2, and their return being 28.325 kg hm2 and 0.932 kg hm-2, respectively. 3) The enrichment ratios of both N (1.324) and P (1.083) were larger than l, demonstrating the two nutrients being continuously accumulated in the community.