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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.
In order to study the dynamics of litterfall production and nutrient under different levels of N and P fertilization, the annual and litterfall production of Schima superba in Zhejiang was studied. The seasonal dynamic pattern of “three peaks” in the range of 6.82-8.30 t · hm-2 · a-1, annual average nitrogen content (excluding P treatment) and annual average phosphorus content increased; the seasonal dynamics of nitrogen and phosphorus content in litter (60.05 ~ 71.47 kg · hm-2 · a-1) and annual return of phosphorus (2.94 ~ 3.93 kg · hm-2 · a-1) Compared with the photosynthetic rate of litter, the N / P ratios of litter under various fertilization treatments were generally higher in early spring (2011) than those in winter (2011), indicating that the long-term application of N and P fertilizers may change the original N and P restriction of forest ecosystem.