Soil pH Dynamics and Nitrogen Transformations Under Long-Term Chemical Fertilization in Four Typical Chinese Croplands
文献类型: 外文期刊
作者: Meng Hong-qi;Lu Jia-long;Meng Hong-qi;Xu Ming-gang;Wang Bo-ren;Zhang Hui-min;Meng Hong-qi;He Xin-hua;Li Jian-wei;Shi Xiao-jun;Peng Chang
作者机构:
关键词: available nutrients;ecosystem;long-term fertilization;N distribution;soil pH
期刊名称: JOURNAL OF INTEGRATIVE AGRICULTURE
ISSN: 2095-3119
年卷期: 2013 年 12 卷 11 期
页码:
收录情况: SCI
摘要: Long-term fertilization experiment provides the platform for understanding the proton budgets in nitrogen transformations of agricultural ecosystems. We analyzed the historical (1990-2005) observations on four agricultural long-term experiments in China (Changping, Chongqing, Gongzhuling and Qiyang) under four different fertilizations, i.e., no-fertilizer (control), sole chemical nitrogen fertilizer (F-N), sole chemical phosphorous and potassium fertilizers (F-PK) and chemical nitrogen, phosphorous and potassium fertilizers (F-NPK). The significant decline in topsoil pH was caused not only by chemical N fertilization (0.29 and 0.89 Delta pH at Gongzhuling and Qiyang, respectively) but also by chemical PK fertilization (0.59 Delta pH at Gongzhuling). The enhancement of available nutrients in the topsoil due to long-term direct nutrients supply with chemical fertilizers was in the descending order of available P (168-599%)>available K (16-189%)>available N (9-33%). The relative rate of soil pH decline was lower under long-term judicious chemical fertilization (-0.036-0.034 Delta pH yr(-1)) than that under long-term sole N or PK fertilization (0.016-0.086 Delta pH yr(-1)). Long-term judicious chemical fertilization with N, P and K elements decreases the nutritional limitation to normal crop growth, under which more N output was distributed in biomass removal rather than the loss via nitrate leaching. We concluded that the N distribution percentage of nitrate leaching to biomass removal might be a suitable indicator to the sensitivity of agricultural ecosystems to acid inputs.
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