| 氮磷添加对荒漠草原土壤养分含量及生态化学计量特征的影响 |
| 摘要点击 1332 全文点击 1221 投稿时间：2022-05-07 修订日期：2022-07-24 |
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| 中文关键词 荒漠草原 养分添加 土壤养分 生态化学计量 |
| 英文关键词 desert grassland nutrient addition soil nutrient ecological stoichiometry |
| 作者 | 单位 | E-mail | | 刘姝萱 | 宁夏大学生态环境学院, 西北土地退化与生态恢复省部共建国家重点实验室培育基地, 西北退化生态系统恢复与重建教育部重点实验室, 银川 750021 | lsx19980123@163.com | | 安慧 | 宁夏大学生态环境学院, 西北土地退化与生态恢复省部共建国家重点实验室培育基地, 西北退化生态系统恢复与重建教育部重点实验室, 银川 750021 | anhui08@163.com | | 张馨文 | 宁夏大学生态环境学院, 西北土地退化与生态恢复省部共建国家重点实验室培育基地, 西北退化生态系统恢复与重建教育部重点实验室, 银川 750021 | | | 邢彬彬 | 宁夏大学生态环境学院, 西北土地退化与生态恢复省部共建国家重点实验室培育基地, 西北退化生态系统恢复与重建教育部重点实验室, 银川 750021 | | | 文志林 | 盐池县草原实验站, 宁夏农牧交错带温性草原生态系统定位观测研究站, 盐池 751506 | | | 王波 | 宁夏回族自治区草原工作站, 银川 750004 | |
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| 中文摘要 |
| 为明确土壤养分含量及化学计量比对多种限制性养分添加的响应，分析土壤中速效养分与全量养分相关关系，以及土壤全量和速效化学计量特征的指示作用，阐明养分添加对荒漠草原土壤养分动态平衡关系的影响.以宁夏荒漠草原为研究对象，于2018年开始进行氮（N）和磷（P）养分添加控制试验，试验处理包括对照（CK）、N添加、P添加和NP共同添加这4个处理.结果表明：①养分添加第4年，土壤N含量显著增加；N添加显著增加土壤N ：P，P添加和NP共同添加显著增加土壤有机碳（SOC）含量.养分添加第3年和第4年，N添加显著提高土壤速效N ：P （AN ：AP）；N添加和NP共同添加显著增加土壤铵态氮（NH4+-N）和硝态氮（NO3--N）含量，而降低土壤速效C ：N （C ：AN）；P添加和NP共同添加显著增加土壤全磷（TP）和速效磷（AP）含量，而降低土壤全量和速效N ：P、C ：P.②N添加和P添加对荒漠草原土壤NH4+-N、AP含量和土壤速效C ：N、AN ：AP的影响具有显著交互作用.③荒漠草原具有较为稳定的C ：N，N ：P主要受土壤P含量的限制，速效C ：P （C ：AP）和AN ：AP主要受土壤AP含量的限制.④N、P养分添加对土壤TN、SOC和无机氮的影响具有累积性效应，N添加缓解荒漠草原N限制，P添加和NP添加加剧荒漠草原N限制.土壤速效化学计量特征变异系数均大于土壤全量化学计量特征变异系数，荒漠草原土壤速效化学计量对N、P养分添加更敏感，可更好反映N、P养分添加对荒漠草原土壤生态化学计量的影响，更快速地指示土壤养分状况. |
| 英文摘要 |
| 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 of nutrient addition treatments. The Ningxia desert grassland was used as the research object to carry out nitrogen (N) and phosphorus (P) addition experiments. The experiment included four treatments:control (CK), N addition[10 g·(m2·a)-1], P addition[10 g·(m2·a)-1], and NP co-addition (10 g·(m2·a)-1 N+10 g·(m2·a)-1 P). The results showed that:① in the fourth year of nutrient addition, soil total nitrogen (TN) content was significantly increased. The 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, the 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 the soil available C:N ratio. P addition and NP co-addition significantly increased total phosphorus (TP) and soil available phosphorus (AP), whereas it significantly reduced the soil total and available C:P and N:P ratios. ② The interaction between N addition and P addition had a combined effect on NH4+-N, AP, available C:N, and AN:AP ratio of desert grassland. ③ The soil C:N ratio was relatively stable in desert grassland, soil N:P ratio was mainly limited by soil TP content, and the soil available C:P and AN:AP ratios were mainly limited by soil AP content. ④ There were cumulative effects of N and P additions on soil N, SOC, and inorganic nitrogen. N limitation in desert grassland was alleviated by N addition, whereas it 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 rapid indicator of soil nutrient status in desert grassland. |
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