Effects of Nitrogen and Phosphorus Addition on Soil Nutrient Content and Stoichiometry in Desert Grassland
Effects of Nitrogen and Phosphorus Addition on Soil Nutrient Content and Stoichiometry in Desert Grassland
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DOI：
10.13227/j.hjkx.202205072
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发表时间：
2023-05-01
期刊：
影响因子：
--
通讯作者：
Wang, Bo
中科院分区：
文献类型：
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作者：
Liu, Shu-xuan;An, Hui;Wang, Bo
为了探讨多种限制性养分添加对土壤养分含量、化学计量比和动态养分平衡的响应，研究了荒漠草原土壤速效养分与全效养分的相关性，以及土壤全效化学计量特征的指示。以宁夏荒漠草原为研究对象，进行了氮(N)和磷(P)添加试验。试验包括4个处理：对照（CK）、N添加[10 g.(m(2)]。a) (-1)]， P加[10 g.(m(2)]。a) (-1)]， NP共加(10 g.（m(2)）。a) (-1) N+ 10g .（m(2)）。a) (-1) P)。结果表明：施肥第4年时，土壤全氮（TN）含量显著提高。施氮显著提高了氮磷比，施磷和共施NP显著提高了土壤有机碳含量。施氮第3、4年时，施氮显著提高了土壤速效氮磷比（AN:AP）；N添加和NP共添加显著提高了铵态氮（NH4+-N）和硝态氮（NO3——N）含量，显著降低了土壤有效碳氮比。磷添加和NP共添加显著提高了土壤全磷（TP）和速效磷（AP），显著降低了土壤全碳磷比、速效碳磷比和氮磷比。加氮加磷的交互作用对荒漠草地NH4+-N、速效氮、有效C:N和硝态氮比有综合影响。荒漠草原土壤C:N相对稳定，土壤N:P主要受土壤全磷含量限制，土壤有效C:P和氮氮比主要受土壤AP含量限制。氮、磷添加对土壤氮、有机碳和无机氮具有累积效应。N添加能缓解荒漠草地的氮限制，P添加和NP共添加则加重了氮限制。土壤速效化学计量特征变异系数高于土壤全化学计量特征变异系数。荒漠草原土壤速效化学计量比全化学计量对N、P添加更为敏感，能更好地反映N、P添加对土壤生态化学计量的影响，是荒漠草原土壤养分状况的快速指标。
In order to discuss the response of soil nutrient content, stoichiometric ratio and dynamic nutrient balance to the addition of multiple restrictive nutrients, the correlation between available nutrients and total nutrients in soil, as well as the indication of soil total and available stoichiometric characteristics were studied in a desert grassland subjected to 4-years nutrient addition treatments. Ningxia desert grassland was used as the research object to carry out nitrogen (N) and phosphorus (P) addition experiments. The experimental includes four treatments: control (CK), N addition [10 g.(m(2).a) (-1)], P addition [10 g.(m(2).a) (-1)], and NP co-addition (10 g.(m(2).a) (-1) N+10 g.(m(2).a) (-1) P).The results showed that: In the fourth years of nutrient addition, soil total nitrogen (TN) content was significantly increased. N:P ratio was significantly increased by N addition, and soil organic carbon (SOC) content was significantly increased by P addition and NP co-addition. In the third and fourth years of nutrient addition, soil available N:P ratio (AN:AP) was significantly increased by N addition; N addition and NP co-addition significantly increased the content of ammonium nitrogen (NH4+-N) and nitrate nitrogen (NO3--N), but significantly reduced soil available C:N ratio. P addition and NP co-addition significantly increased total phosphorus (TP), and soil available phosphorus (AP), while significantly reduced soil total and available C:P and N:P ratio. The interaction between N addition and P addition has combined effect on NH4+-N, AP, available C:N and AN:AP ratio of desert grassland. Soil C:N ratio have been relatively stable in desert grassland, soil N:P ratio was mainly limited by soil TP content, soil available C:P and AN:AP radio were mainly limited by soil AP content. There was cumulative effects of N and P additions on soil N, SOC and inorganic nitrogen. N limitation in desert grassland was alleviated by N addition, while was aggravated by P addition and NP co-addition. The variation coefficients of soil available stoichiometric characteristics were higher than that of soil total stoichiometric characteristics. Soil available stoichiometry was more sensitive to N and P addition than soil total stoichiometry in desert grassland, which could better reflect the effects of N and P addition on soil ecological stoichiometry, and as a rapidly indicator of soil nutrient status in desert grassland.