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增施氮磷肥对木荷林凋落物生产量及其养分的影响

吕妍1,2,郑泽梅1,2**,美丽班·马木提1,2,陆江1,2,王希华1,2   

  1. (1华东师范大学环境科学系, 上海 200062; 2浙江天童森林生态系统国家野外科学观测研究站, 浙江宁波 315114)
  • 出版日期:2013-11-18 发布日期:2013-11-18

Effects of nitrogen and phosphorus fertilization on litterfall production and nutrient dynamics in a Schima superba forest in Zhejiang Province of East China.

LU  Yan1,2, ZHENG Ze-mei1,2, MEILIBAN Mamuti1,2, LU Jiang1,2, WANG Xi-hua1,2   

  1. (1Department of Environmental Science, East China Normal University, Shanghai 200062, China; 2Tiantong National Station of Forest Ecosystem, Chinese National Ecosystem Observation and Research Network, Ningbo 315114, Zhejiang, China)
  • Online:2013-11-18 Published:2013-11-18

摘要: 以浙江天童常绿阔叶林木荷群落为对象,2011年研究了不同施氮磷肥水平下凋落物生产量和养分动态特征.结果表明: 增施氮磷肥处理后,木荷群落凋落物的年生产量在6.82~8.30 t·hm-2·a-1,呈“三峰型”季节动态模式;凋落物年平均氮含量(P处理除外)和年平均磷含量增加;凋落物氮磷含量季节动态发生改变,而对凋落物氮年归还量(60.05~7147 kg·hm-2·a-1)和磷年归还量(2.94~3.93 kg·hm-2·a-1)没有显著影响.与对照相比,试验初期(2011年春季)各施肥处理下的凋落叶氮磷比普遍较高,而2011年冬季较低,说明长期施加氮磷肥可能改变森林生态系统原有的氮磷限制状况.

Abstract: In 2011, an investigation was made on the litterfall production and nutrient dynamics in a phosphorus-limited subtropical evergreen broadleaved forest dominated by Schima superba in Tiantong, Zhejiang Province of East China under different levels of nitrogen (N) and phosphorous (P) fertilization. After the N and P fertilization, the annual litterfall production ranged from 6.82 to 8.30 t·hm-2·a-1, with three peaks in May or June, August, and October, respectively. Under fertilization, the annual average N and P oncentrations of the litterfall (except the annual average N concentration under P fertilization) increased, and had a seasonal variation. There were no significant differences in the nitrogen return amount (60.05-71.47 kg·hm-2·a-1) and phosphorus return amount (2.94-3.93 kg·hm-2·a-1) of the litterfall among different treatments. As compared to the control, the N:P ratio of the litterfall under fertilization was higher at the beginning of the experiment (spring, 2011), but lower in the winter, 2011, indicating that nitrogen and phosphorus fertilization could alter the original nitrogen and phosphorus limited conditions of the studied forest ecosystem.