Effects of Irrigation and Nitrogen Application on Soil Nutrients in Triploid Populus tomentosa Stands

文献类型： 外文期刊

第一作者： Zhang, Runzhe

作者： Zhang, Runzhe;Nie, Lishui;Huang, Mengyao;Yang, Hao;Shi, Ce;Wei, Yifan;Song, Lianjun;Zhu, Jialei;Bo, Huijuan;Wang, Jiang;Nie, Haoliang

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关键词： irrigation; nitrogen; soil nutrients; triploid Populus tomentosa; plantation

期刊名称：FORESTS （ 影响因子：3.282； 五年影响因子：3.292 ）

ISSN：

年卷期： 2022 年 13 卷 7 期

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收录情况： SCI

摘要： Irrigation and nitrogen application directly affect the availability and distribution of soil nutrients. Understanding the response of soil nutrients to long-term water-fertilizer coupling conditions is helpful to improve the management and use efficiency. Irrigation was divided into three gradient levels, which accounted for 45%, 60%, and 75% (W1, W2, and W3) of the field water holding capacity. Based on pure nitrogen, four levels of nitrogen application were set: 0.0, 101.6, 203.2, and 304.8 kg center dot hm(-2) (N0, N1, N2, and N3). We measured tree height and diameter at breast height (DBH), and we analyzed the chemical properties of the soil at 0-40 cm depth, from 2007 to 2020. The ranges of DBH, tree height, individual volume, and stand volume were 5.80-25.25 cm, 6.10-16.47 m, 0.01-0.37 m(3), and 11.76-481.47 m(3)center dot hm(-2), respectively. The contents of organic matter, total nitrogen, available phosphorus, and available potassium in the soil ranged from 8.60 g center dot kg(-1) to 18.72 g center dot kg(-1), from 0.21 g center dot kg(-1) to 0.79 g center dot kg(-1), from 8.09 mg center dot kg(-1) to 47.05 mg center dot kg(-1), and from 90 mg center dot kg(-1) to 322 mg center dot kg(-1), respectively. Soil pH value decreased rapidly at a rate of 0.31 units per year for the first five years. Irrigation and nitrogen application, and their interaction, had significant (p < 0.01) effects on soil total nitrogen, available phosphorus, available potassium, and nitrate-nitrogen. We suggest maintaining the field water holding capacity above 60%, with a nitrogen application rate of 203.2 kg center dot hm(-2), to save water, maintain soil fertility, and optimize soil nitrogen supply. Our study aimed to achieve scientific and accurate fertilization of Populus tomentosa stands over different periods, to alleviate the decline of soil fertility, and to improve the utilization rate of water and fertilizer through long-term nutrient monitoring.

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