Effects of Fertilization on the Nitrogen Residual Amounts and Leaching from Citrus Orchard Soil in the Three Gorges Reservoir Area

被引：2
|
作者：
Wang T. [1 ]
Huang Z.-L. [1 ]
Zeng L.-X. [1 ]
Xiao W.-F. [1 ]
Song W.-M. [2 ]
机构：
[1] State Forestry Administration Key Laboratory of Forest Ecology and Environment, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing
[2] Forestry Bureau of Zigui County, Yichang
来源：
Huanjing Kexue/Environmental Science | 2019年 / 40卷 / 03期
关键词：
Citrus orchard soil; Fertilization; Leaching and residual amounts; Nitrogen; Three Gorges Reservoir Area;
D O I：
10.13227/j.hjkx.201805147
中图分类号：
学科分类号：
摘要：
This experiment has the citrus orchard soil in the basin of the Zigui County Ecological Station in the Three Gorges Reservoir Area as its research object. Leaching tests of an undisturbed soil column at 0-20, 0-40, and 0-60 cm depth were performed in a citrus orchard. The effects of nitrogen leaching and residual amounts in the soil were studied. Four kinds of fertilization treatments were set up in the experiment: no fertilization treatment(CK), low nitrogen fertilization treatment (T1:250kg•hm-2), medium nitrogen fertilization treatment (T2:500kg•hm-2), and high nitrogen fertilization treatment (T3:750kg•hm-2). The results showed that: ① The main form of nitrogen leaching in citrus orchard soil was nitrate nitrogen (NO3--N), accounting for 36.93%-60.07% of total nitrogen (TN) leaching. The ratio of TN to ammonium nitrogen (NH4+-N) was 4.40% to 5.79%. The ratio of NO3--N residues in soil to TN residues was 11.31‰-45.66‰, and the ratio of NH4+-N residues to TN residues was 1.051‰-2.07‰. ②Nitrogen leaching and residual amounts in citrus orchards at the same depth showed significant positive correlation with the amount of fertilizer applied. The leaching losses and residual amounts of TN in soil at different fertilization rates were 11.35-30.11 kg•hm-2and 0.30-1.86 g•kg-1, respectively. Among them, the ratio of leaching losses of NO3--N and NH4+-N to TN leaching amounts peaked under T2 treatment, and the peaks of NO3--N and NH4+-N residues in TN residual amounts appeared in T1 and T2 treatment, respectively. ③ Given the same fertilization amounts, the leaching amounts and residual amounts of different forms of nitrogen in the soil were greatly affected by soil depth. After fertilization, the peaks of NO3--N leaching and residual amounts appeared at 20 cm and 40 cm, respectively, and the peaks of NH4+-N leaching and residual amounts mainly appeared at 20 cm depth. Inferred from the results of the experiment, the neutral nitrogen treatment in the 0-40 cm soil column is more conducive to the conversion of fertilizer nitrogen to inorganic nitrogen for plant absorption, and reduces the risk of nitrogen leaching after fertilization. © 2019, Science Press. All right reserved.
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页码：1468 / 1474
页数：6
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