空青山次生栎林细根周转

Studies on the Turnover of Fine Roots in the Secondary Oak Forest of Kongqing Hill

对苏南空青山次生栎林细根周转进行了研究，结果表明，栎林细根的年周转率为０．３７，活细根和死细根的生物量分别为１６８０９．１７ｋｇ／ｈｍ２和３２７３．０４ｋｇ／ｈｍ２，细根年生长量为６１９２．４３ｋｇ／ｈｍ２，约占地上部分净初级生产力总量的４７％，细根年死亡量为４３０２．３１ｋｇ／ｈｍ２，占地上部分年凋落物总量的４５％。因此，在森林生态系统养分循环和凋落物中，细根对归还土壤养分起着重要作用。

This paper is about the turnover of fine roots in the secondary oak forest of Kongqing hill in the south of Jiangsu province. The results showed that annual turnover of fine foots in the secondary oak forest was 0.37. The biomass of living and dead fine roots of the stand was 16809.17kg/hm 2and 3273.04kg/hm 2 respectively. The annual production of the fine roots was 6192.43kg/hm 2·a,which was about 47% of total net productivity aboveground, and annual mortality was 4302.31kg/hm 2, corresponding to 45% of annual litter aboveground. So the fine roots played an important role in returning nutrients to soil, they should be payed attention to studying the litter and nutrient cycling in forest ecosystem.