模拟增温和氮素添加对高寒草甸草地的影响
发布时间：2018-07-14 20:44
【摘要】：2013和2014两年在青海大学-清华大学三江源草地生态环境监测定位站进行野外条件下模拟增温和氮素添加对高寒草地群落及土壤养分含量的影响的试验研究,以探索高寒草甸草地土壤碳氮对模拟增温和氮素添加的响应机制。试验表明:(1)植被高度、盖度、优良牧草生物量在增温(F)处理下均高于对照,且在增温施氮互作下均为(A)增温施铵态氮处理最高,显著高于(F)增温不施氮和(M)对照处理(P0.05),增温(F)、(H)施铵态氮处理比对照也有所增加。(2)土壤温度0-15和15-30cm均为(F)增温不施氮(A)增温施铵态氮(H)施铵态氮(M)对照,土壤湿度为(A)增温施铵态氮处理最高,且土壤温湿度最高出现在7月低。(3)2014和2013年土壤全氮含量0-15cm和15-30cm(A)增温施铵态氮处理显著高于(M)对照处理(P0.05),全磷含量2014和2013年均为(L)不增温施硝态氮处理最高,而全钾含量则为F处理最高。其含量随土层加深而减少。速效氮、磷与全氮、磷结论基本一致,速效钾也为(L)不增温施硝态氮处理下最高。土壤铵态氮含量2014和2013年0-15和15-30cm土层均为(A)增温施铵态氮处理显著高于(F)增温不施氮、(M)对照处理,2014年0-15cm和2013年土壤硝态氮含量(B)增温施氮(铵态:硝态=70:30)处理显著M处理(P0.05),而2014年15-30cm L处理显著高于(F)增温不施氮、(M)对照处理(P0.05)。增温施氮使得土壤有机质含量在(A)增温施铵态氮处理下明显增加,且2014年和2013年均为随着土层加深有机质含量明显降低,2014和2013年0-15cm和15-30cm土壤有机碳含量(A)增温施铵态氮处理显著高于(M)对照处理(P0.05)。(4)0-15cm和15-30cm土壤C/N比均为(A)增温施铵态氮处理最高,各处理之间均无显著差异(P0.05)。总体来说,(A)增温施铵态氮处理更有利于植物生长和土壤营养元素的增加。
[Abstract]:In 2013 and 2014, the effects of simulated warming and nitrogen supplementation on alpine grassland community and soil nutrient content were studied at Sanjiangyuan grassland Ecological Environment Monitoring Positioning Station of Qinghai University-Tsinghua University in the field. To explore the response mechanism of soil carbon and nitrogen to simulated warming and nitrogen addition in alpine meadow grassland. The results showed that: (1) the vegetation height, coverage and biomass of fine forage were all higher than that of the control under the condition of increasing temperature (F), and were the highest under the interaction of (A) and ammonium. It was significantly higher than that of (F) and (M) treatments (P0.05), and that of F), (H treatment was higher than that of the control. (2) soil temperature 0-15 and 15-30cm were (F), no nitrogen, (A), and ammonium nitrogen (M), respectively. The soil moisture was the highest under the treatment of (A) warming and ammonium nitrogen application. The highest soil temperature and humidity occurred in July. (3) soil total nitrogen contents in 2014 and 2013 were significantly higher in 0-15cm and 15-30cm (A) treatments than in control treatments (P 0.05). Total phosphorus contents in 2014 and 2013 were (L) and (L) no nitrate-N treatments. The total potassium content was the highest in F treatment. Its content decreases with the deepening of soil layer. The results of available nitrogen, phosphorus and total nitrogen and phosphorus were basically the same, and the available potassium was the highest under the condition of (L) application of nitrate-N without increasing temperature. The soil ammonium nitrogen contents in 2014 and 2013 0-15 and 15-30cm soil layers were significantly higher than those in (F) and (F) and (M) control treatments. In 2014, 0-15cm and 2013 0-15cm and 2013 were treated with nitrogen (ammonium: nitrate 70: 30). M treatment (P0.05), and 2014 15-30cm L treatment was significantly higher than (F) warming and no nitrogen application, (M) control treatment (P0.05). The content of soil organic matter increased obviously under the condition of (A) heating and ammonium nitrogen application. The organic carbon content of 0-15cm and 15-30cm soil in 2014 and 2013 were significantly decreased with the increase of soil organic matter content. The C / N ratio of 0-15cm and 15-30cm was the highest in 0-15cm and 15-30cm treatments (P0.05). (4, P 0.05, P 0.05), and the soil organic carbon content in 2014 and 2013 was significantly higher than that in the control (P 0.05). (4), the C / N ratio of 0-15cm and 15-30cm was the highest in both 0-15cm and 15-30cm treatments. There was no significant difference among the treatments (P0.05). In general, (A) warming and ammonium nitrogen treatment were more favorable to plant growth and increase of soil nutrient elements.
【学位授予单位】：青海大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S812
[Abstract]:In 2013 and 2014, the effects of simulated warming and nitrogen supplementation on alpine grassland community and soil nutrient content were studied at Sanjiangyuan grassland Ecological Environment Monitoring Positioning Station of Qinghai University-Tsinghua University in the field. To explore the response mechanism of soil carbon and nitrogen to simulated warming and nitrogen addition in alpine meadow grassland. The results showed that: (1) the vegetation height, coverage and biomass of fine forage were all higher than that of the control under the condition of increasing temperature (F), and were the highest under the interaction of (A) and ammonium. It was significantly higher than that of (F) and (M) treatments (P0.05), and that of F), (H treatment was higher than that of the control. (2) soil temperature 0-15 and 15-30cm were (F), no nitrogen, (A), and ammonium nitrogen (M), respectively. The soil moisture was the highest under the treatment of (A) warming and ammonium nitrogen application. The highest soil temperature and humidity occurred in July. (3) soil total nitrogen contents in 2014 and 2013 were significantly higher in 0-15cm and 15-30cm (A) treatments than in control treatments (P 0.05). Total phosphorus contents in 2014 and 2013 were (L) and (L) no nitrate-N treatments. The total potassium content was the highest in F treatment. Its content decreases with the deepening of soil layer. The results of available nitrogen, phosphorus and total nitrogen and phosphorus were basically the same, and the available potassium was the highest under the condition of (L) application of nitrate-N without increasing temperature. The soil ammonium nitrogen contents in 2014 and 2013 0-15 and 15-30cm soil layers were significantly higher than those in (F) and (F) and (M) control treatments. In 2014, 0-15cm and 2013 0-15cm and 2013 were treated with nitrogen (ammonium: nitrate 70: 30). M treatment (P0.05), and 2014 15-30cm L treatment was significantly higher than (F) warming and no nitrogen application, (M) control treatment (P0.05). The content of soil organic matter increased obviously under the condition of (A) heating and ammonium nitrogen application. The organic carbon content of 0-15cm and 15-30cm soil in 2014 and 2013 were significantly decreased with the increase of soil organic matter content. The C / N ratio of 0-15cm and 15-30cm was the highest in 0-15cm and 15-30cm treatments (P0.05). (4, P 0.05, P 0.05), and the soil organic carbon content in 2014 and 2013 was significantly higher than that in the control (P 0.05). (4), the C / N ratio of 0-15cm and 15-30cm was the highest in both 0-15cm and 15-30cm treatments. There was no significant difference among the treatments (P0.05). In general, (A) warming and ammonium nitrogen treatment were more favorable to plant growth and increase of soil nutrient elements.
【学位授予单位】：青海大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S812
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相关期刊论文 前10条
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2 徐满厚;薛娴;;气候变暖对高寒地区植物生长与物候影响分析[J];干旱区资源与环境;2013年03期
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