Effect of Nitrogen and Phosphorus Addition on Litterfall Production and Nutrient Dynamics in a Castanopsis sclerophylla Secondary Forest

doi:10.11924/j.issn.1000-6850.casb15110145

Abstract

Abstract: China is one of the regions with high N deposition in the world. Nitrogen deposition has a serious impact on the structure and function of forest ecosystem. The paper aims to reveal the effects of increasing N deposition on litter production and related nutrient returns in forest ecosystem, an experiment of N and P addition was conducted in a secondary Castanopsis sclerophylla forest. In the field simulated experiment, 4 treatments were designed as CK, P addition (P), high N addition (HN), and high N P addition (HN P), with 3 replicates for each treatment. The results from the one- year observation showed that: annual litterfall productions were 8.69, 8.11, and 9.41 t/hm2 for P, HN and HN P treatment, significantly higher than that of the CK (7.68 t/hm2). The amount of nutrient returns by litterfall was all increased to some degree due to N and P addition. The order of the total nutrient returns was: HN P＞P＞HN＞CK. The N and P addition also increased the amount of nutrient returns annually. The N and P addition increased the nutrient elements return in an order of N＞Ca＞K＞Mg＞P. These results indicated that N and P addition improved the litterfall quantity and related nutrient return. High N plus P could maintain the balance of soil nitrogen and phosphorus, significantly increase litter productivity.

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