| 柯韵,杨红薇,王小国,胡廷旭,刘韵,朱波.紫色土坡耕地退耕还林对土壤N2O排放的影响[J].农业环境科学学报,2015,34(7):1398-1406. |
| 紫色土坡耕地退耕还林对土壤N2O排放的影响 |
| Effect of Returning Cropland to Forestland on N2O Emissions from Sloping Purple Soil |
| 投稿时间：2015-02-05 |
| DOI：10.11654/jaes.2015.07.024 |
| 中文关键词: 紫色土 桤柏混交林地 坡耕地 退耕还林 N2O |
| 英文关键词: purple soil alder and cypress mixed forest land sloping cropland returning cropland to forestland N2O |
| 基金项目:国家重点基础研究计划项目(2012CB417101);国家自然科学基金项目(41271321) |
| 作者 | 单位 | E-mail | | 柯韵 | 西南交通大学地球科学与环境工程学院, 成都 610031
中国科学院山地表生过程与生态调控重点实验室, 成都 610041 | | | 杨红薇 | 西南交通大学地球科学与环境工程学院, 成都 610031 | | | 王小国 | 中国科学院山地表生过程与生态调控重点实验室, 成都 610041
中国科学院成都山地灾害与环境研究所, 成都 610041 | | | 胡廷旭 | 中国科学院山地表生过程与生态调控重点实验室, 成都 610041
中国科学院成都山地灾害与环境研究所, 成都 610041
中国科学院大学, 北京 100049 | | | 刘韵 | 中国科学院山地表生过程与生态调控重点实验室, 成都 610041
中国科学院成都山地灾害与环境研究所, 成都 610041
中国科学院大学, 北京 100049 | | | 朱波 | 中国科学院山地表生过程与生态调控重点实验室, 成都 610041
中国科学院成都山地灾害与环境研究所, 成都 610041 | bzhu@imde.ac.cn |
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| 中文摘要: |
| 采用静态暗箱-气相色谱法对紫色土坡耕地常规施肥处理(CL)、坡耕地不施肥处理(CL-CK)和退耕15、30年的桤柏混交林地(FL15、 FL30)的土壤N2O排放通量进行为期1年的观测,同时测定土壤温度、土壤湿度、土壤无机氮含量等。结果表明,观测期内CL、CL-CK、FL15与FL30的N2O平均释放速率分别是25.6、6.60、1.20、4.35 μg N2O-N·m-2·h-1,CL小麦季N2O平均释放速率是18.0 μg N2O-N·m-2·h-1,玉米季35.2 μg N2O-N·m-2·h-1,CL土壤N2O排放速率显著高于CL-CK、FL15和FL30(P < 0.01),且CL-CK高于FL15、FL30(P < 0.01),FL30高于FL15(P < 0.01)。CL、CL-CK、FL15和FL30全年的N2O排放量分别为1.01、0.400、0.050、0.310 kg N2O-N·hm-2。比较CL以及CL-CK的N2O排放总量,停止施氮的措施对土壤N2O排放的减排潜力达到0.610 kg N2O-N·hm-2。与CL-CK相比,FL15、FL30土壤N2O释放量分别减少0.350、0.090 kg N2O-N·hm-2,主要原因是退耕后土壤碳氮比升高,土壤无机养分、温度以及湿度等发生变化。 |
| 英文摘要: |
| Cropland is a large source of global N2O emissions, while forestland emits much less N2O. Thus, returning cropland to forestland would help reduce global N2O emissions. Here static chamber-GC technique was used to compare soil N2O emission fluxes from sloping cropland(CL) and forestland returned from cropland for 15 and 30 years. Soil temperature, moisture, nitrate(NO3--N) and ammonia(NH4+-N) nitrogen content in the soils were also recorded for one year. Results showed that average fluxes of soil N2O from CL, CL-CK(CL-Check test), FL15 and FL30(15 and 30 years old forest) were 25.6, 6.60, 1.20, and 4.35 μg N2O-N·m-2·h-1, respectively, with significantly higher N2O emissions from CL than from CL-CK, FL15 and FL30(P < 0.01). The N2O emissions from FL30 were also significantly higher than that from FL15(P < 0.01). Annual cumulative N2O emissions from CL, CL-CK, FL15 and FL30 were respectively 1.01, 0.400, 0.050, and 0.310 kg N2O-N·hm-2. The potential of N2O mitigation by nitrogen fertilizer reduction was as high as 0.620 kg N2O-N·hm-2. Compared with CL-CK, FL15 and FL30 reduced N2O emissions by 0.350 and 0.090 kg N2O-N·hm-2, respectively, may due to increases in soil carbon to nitrogen ratios and changes in soil properties. |
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