Nutrient cycling in Castanea mollissima Bl forest at the Miyun Reservoir Watershed, Beijing

Abstract

Abstract: Studies on the nutrient cycling in Costariea moLLissima Bl forest at the Miyun reservoir watershed, Beijing, showed that the total biomass of the Castanea mollissima Bl stands at age 22 was 38638 kg· hm^-2, and the biomass of their stem, branch, leaf, blossom, chestnut, seed capsule and root was 20160, 8430, 1429, 873, 1024, 800 and 5922 kg·hm^-2, occupying 52.18%, 21.82%, 3.70%, 2.26%, 2.65%, 2.07%, 15.33% of the total biomass, respectively.The annual average growth amount of stem, branch, and root was 916, 383, and 269 kg·hm^-2, respectively, and the total annual average growth amount was 5694 kg·hm^-2.The nutrient contents in different organs of Castanea mollissima Bl stands showed that the Ncontent sequence was leaf>blossom > chestnut > seed capsule > branch > stem, Pcontent sequence was leaf > blossom > branch>stem > seed capsule > cheatnut, Kcontent sequence was chestnut > blossom > leaf > chestnut > branch>stem, Ca content sequence leaf > seed capsule > branch > stem > blossom > chestnut, and Mg content sequence was leaf > blossom > branch > chestnut > seed capsule > stem.The storage of N, P, K, Ca and Mg in Castanea mollissima Bl forest was 89.47, 17.34, 74.68, 105.49 and 28.40 kg·hm^-2, respectively.The nutrient annual assimilation was 79.17 kg·hm^-2, the total annual returning amount 106.55 kg·hm^-2, and the annual retention amount was 11.25 kg·hm^-2.Among of the total returning, atmospheric dry and wet deposition was 38.36 kg-hm, and the litter returning was 58.08 kg·hm².The nutrient input was a little more than the output.The storage of the five nutrient elements in0～30 cm soil layer was 206427.59 kg·hm^-2, and their storage amount in stands only occupied about 0.15% of the total storage in soil.The absorption coefficient of the stands was N>P>K>Ca> Mg, the utilization coefficient was K > N > Mg > P > Ca, and the cycling coefficient was K > N > P> Mg > Ca.The turnover period of the N, P, K, Ca and Mg was 4.34, 7.51, 3.31, 12.90 and 6.45 yr, respectively.

CLC Number:

S718.5

LIU Shihai, YU Xinxiao, HU Chunhong, GAO Guoxiong . Nutrient cycling in Castanea mollissima Bl forest at the Miyun Reservoir Watershed, Beijing[J]. Chinese Journal of Applied Ecology, 2003, (10): 1597-1601.

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