| 黄土丘陵区退耕草地土壤呼吸及其组分对氮磷添加的响应 |
| 摘要点击 1272 全文点击 492 投稿时间：2019-06-03 修订日期：2019-07-23 |
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| 中文关键词 土壤呼吸 自养呼吸 异养呼吸 氮磷添加 温度敏感性 |
| 英文关键词 soil respiration autotrophic respiration heterotrophic respiration N and P addition temperature sensitivity |
| 作者 | 单位 | E-mail | | 周俊杰 | 西北农林科技大学水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨凌 712100 | zjj9598@126.com | | 陈志飞 | 西北农林科技大学水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨凌 712100 | | | 杨全 | 中国科学院水利部水土保持研究所, 杨凌 712100 | | | 赖帅彬 | 西北农林科技大学水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨凌 712100 | | | 王智 | 西北农林科技大学水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨凌 712100
中国科学院水利部水土保持研究所, 杨凌 712100 | | | 徐炳成 | 西北农林科技大学水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨凌 712100
中国科学院水利部水土保持研究所, 杨凌 712100 | Bcxu@ms.iswc.ac.cn |
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| 中文摘要 |
| 为探究不同氮磷添加水平对黄土丘陵区退耕草地土壤呼吸及其组分的影响，于2018年5~9月采用田间试验的方法，设置3个施氮（以N计）主区[0、50和100 kg·（hm2·a）-1]和3个施磷（以P2O5计）副区[0、40和80 kg·（hm2·a）-1].测定每月各处理下土壤总呼吸和异养呼吸速率，以及土壤温度和土壤含水量.结果表明，氮磷添加对土壤温度和土壤水分的影响均不显著（P>0.05）.土壤呼吸速率具明显月份变化特征，在7月达到峰值.未施肥处理的月平均土壤总呼吸、异养呼吸和自养呼吸分别为0.69、0.39和0.29 g·（m2·h）-1.未施氮条件下，施磷对土壤呼吸及其组分无显著影响（P >0.05）.施氮条件下，磷添加显著提高土壤呼吸及其组分的呼吸速率（P<0.05），氮磷配施后月平均土壤总呼吸、异养呼吸和自养呼吸最大值分别为0.93、0.50和0.47 g·（m2·h）-1.未施肥的土壤总呼吸、异养呼吸和自养呼吸的Q10值分别为1.86、2.36和2.24；氮磷添加降低了土壤呼吸及其组分的Q10值.总体上，氮磷添加对黄土丘陵区退耕草地土壤呼吸及其组分的影响与施氮磷量有关. |
| 英文摘要 |
| Understanding the soil respiration characteristics in response to nitrogen and phosphorus addition in farming-withdrawn grasslands within semi-arid loess hilly-gully regions is of great importance for providing a theoretical basis for evaluating the effects of artificial regulation approaches on carbon cycling. We report on a field experiment that was undertaken from May to September 2018 in a farming-withdrawn grassland ecosystem in China, which is dominated by Stipa bungeana and Lespedeza davurica. Three different levels of nitrogen and phosphorus additions were used, including three main plots of N[0, 50, and 100 kg·(hm2·a)-1] and three subplots of P (P2O5)[0,40, and 80 kg·(hm2·a)-1]. The soil respiration rate, heterotrophic respiration rate, soil temperature, and soil moisture were measured monthly in each treatment. Results showed that N and P addition had no effect on soil temperature or moisture content (P>0.05). The soil respiration rate showed an obvious monthly variation and peaked in July. In the treatment without fertilizer addition, the monthly mean soil respiration rate, heterotrophic respiration rate, and autotrophic respiration rate were 0.69, 0.39, and 0.29 g·(m2·h)-1, respectively. P addition had no significant effect on the soil respiration rate and its components without N addition (P>0.05). Under conditions of N addition, P addition significantly increased the soil respiration rate and its component (P<0.05). The monthly mean soil respiration rate, heterotrophic respiration rate, and autotrophic respiration rate were 0.93, 0.50, and 0.47 g·(m2·h)-1, respectively. The Q10 (i.e., temperature sensitivity) values for soil respiration, heterotrophic respiration, and autotrophic respiration in unfertilized soil were 1.86, 2.36, and 2.24, respectively. The addition of N and P reduced the Q10 value of soil respiration and its components. Our findings suggest that the response of soil respiration and its two components to N and P addition in studied farming-withdrawn grassland in the semiarid loess hilly-gully region were closely related to their addition amounts. |
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