Effect of soil nutrient pool on nutrient resorption in senescent leaves of Fargesia denudata

Abstract

Abstract: The stocks of soil nutrient and nutrient resorption in senescent leaves and the relationships between them under Fargesia denudata with three densities were investigated in Wanglang National Nature Reserve,Western Sichuan.The results showed that bamboo density influenced significantly on the stocks of N,P,K,Ca and Mg in the soil.The P stock decreased significantly with the increase of density (P<0.01),and the stock for D1,D2 and D3 was 0.274,0.222 and 0.158 kg·m^-2 ,respectively.However,the stocks of both Ca and Mg increased with the increase of arrow bamboo density,and the stocks of Ca and Mg for D1,D2 and D3 were 2.64 and 1.70 kg·m^-2 ,4.42 and 1.80 kg·m^-2 ,as well as 4.85 and 2.12 kg·m^-2 ,respectively.The differences of N and K stocks between different densities of bamboo community were not significant,and the stocks of N and K for D1,D2 and D3 were 1.10 and 3.19 kg·m^-2 ,1.04 and 3.30 kg·m^-2 ,as well as 1.06 and 3.19 kg·m^-2 , respectively.The capacity of nutrient resorptions in senescent leaves varied greatly with the density of the bamboo community.The resorption ability of P in senescent leaves increased with the increase of arrow bamboo density,and the percentage of P resorption was 45.3%,50.9% and 65.8% respectively.On the contrary,the resorption ability of Ca and Mg in senescent leaves decreased significantly with the increase of density,and the resorption percentages of Ca and Mg were -44.1% and 29.1%,-83.3% and 2.4%,as well as -120.8% and -215% respectively.The resorption ability of N and K in senescent leaves did not vary with the bamboo density,and the resorption percentages of N and K were 71.2% and 78.2%,70.8% and 80.0%,as well as 70.8% and 80.9% respectively.It is suggested that the soil nutrient pool related to arrow bamboo density was associated with the nutrient resorption in senescent leaves.Possible mechanism was that arrow bamboo growth would change soil nutrient pools,and in turn,the ability of nutrient resorption in senescent leaves also feed back to the soil nutrient pool.This reflected the interaction between soil and plant.P might be a main factor limiting the growth of arrow bamboo (Fargesia denudata).

Key words: Methane oxidation, Vertical profile

CLC Number:

S158.3

LU Yejiang, WU Fuzhong, YANG Wanqin, WANG Kaiyun, ZHANG Chunna. Effect of soil nutrient pool on nutrient resorption in senescent leaves of Fargesia denudata[J]. cje, 2005, (9): 1058-1062.

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