| 增温施肥对稻麦农田土壤有机碳及其活性组分的影响 |
| 摘要点击 1334 全文点击 516 投稿时间：2022-03-29 修订日期：2022-05-30 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 增温 施肥 稻麦农田 土壤有机碳(SOC) 碳库管理指数 |
| 英文关键词 warming fertilization rice-wheat cropland soil organic carbon(SOC) carbon pool management index |
| 作者 | 单位 | E-mail | | 邓旭哲 | 江苏大学环境与安全工程学院, 镇江 212001
江苏省农业科学院农业资源与环境研究所, 农业农村部长江下游平原农业环境重点实验室, 南京 210014 | dengxuzhe@126.com | | 韩晨 | 江苏省农业科学院农业资源与环境研究所, 农业农村部长江下游平原农业环境重点实验室, 南京 210014
南京农业大学资源与环境科学学院, 南京 210095 | | | 薛利祥 | 江苏省农业科学院农业资源与环境研究所, 农业农村部长江下游平原农业环境重点实验室, 南京 210014 | | | 侯朋福 | 江苏大学环境与安全工程学院, 镇江 212001
江苏省农业科学院农业资源与环境研究所, 农业农村部长江下游平原农业环境重点实验室, 南京 210014
南京农业大学资源与环境科学学院, 南京 210095 | pengfuhou100smby@163.com | | 薛利红 | 江苏大学环境与安全工程学院, 镇江 212001
江苏省农业科学院农业资源与环境研究所, 农业农村部长江下游平原农业环境重点实验室, 南京 210014
南京农业大学资源与环境科学学院, 南京 210095 | | | 杨林章 | 江苏省农业科学院农业资源与环境研究所, 农业农村部长江下游平原农业环境重点实验室, 南京 210014
南京农业大学资源与环境科学学院, 南京 210095 | |
|
| 中文摘要 |
| 农田是重要的陆地生态系统土壤碳库和作物生长的有机养分库.为明确气候变暖对稻麦轮作农田土壤碳库的影响，利用田间开放式增温平台，分析了增温、施肥和其交互作用对土壤有机碳和其活性组分的影响，并评估了土壤碳库管理指数的变化.结果表明，增温、施肥对土壤有机碳含量和其活性有机碳组分的影响均无显著交互作用.增温增加了土壤有机碳含量，且总有机碳（TOC）和惰性有机碳（ROC）含量差异显著.与不增温对照相比，增温处理的TOC、ROC和活性有机碳（LOC）含量分别增加了7.72%、7.42%和10.11%.土壤微生物量碳（MBC）含量的增加（20.4%）和颗粒有机碳（POC）含量的降低（36.51%）可能是增温下土壤有机碳含量变化的主要原因.增温对土壤可溶性有机碳（DOC）含量无显著影响，但显著降低了其可溶性微生物副产物组分含量（41.89%）.结果同时表明，施肥对土壤有机碳含量均无显著影响，但显著降低了活性碳组分的DOC和POC含量，增加了MBC含量.与不施肥对照相比，施肥处理的土壤DOC和POC含量分别降低了35.44%和28.33%，MBC含量增加了33.38%.此外，施肥有增加可溶性有机物中人为源腐殖质组分（5.13%）和可溶性微生物副产物组分（29.41%），降低陆生源腐殖质组分含量（13.33%）的趋势.增温、施肥均有提高土壤碳库管理指数（CPMI）的趋势，土壤碳库指数（CPI）和碳库活度指数（LI）的增加分别是增温和施肥下CPMI增加的主要原因.结果说明，气候变暖会通过对土壤活性碳组分的改变影响土壤碳库，且其效应不受施肥影响. |
| 英文摘要 |
| Farmland is the important soil carbon pool of terrestrial ecosystems and organic nutrient pool for crop growth. To clarify the impact of climate warming on the soil carbon pool, this study analyzed the effects of warming and fertilization on soil organic carbon and its labile components under rice-wheat rotation using a free-air temperature increase system. The variation in soil carbon pool management index (CPMI) was also evaluated. The results showed that the combined effects of warming and fertilization on soil organic carbon content and labile organic carbon components were insignificant. Warming increased the soil organic carbon (SOC) content, and the differences between warming and the ambient control in total organic carbon (TOC) and recalcitrant organic carbon (ROC) reached a statistically significant level. Compared with those under the ambient control, the contents of TOC, ROC, and labile organic carbon (LOC) subjected to warming increased by 7.72%, 7.42%, and 10.11%, respectively. The increased microbial biomass carbon (MBC) content (20.4%) and decreased particulate organic carbon (POC) content (36.51%) may have been the main reason for the variation in SOC. Warming showed no significant effect on soil dissolved organic carbon (DOC) content, whereas it markedly reduced its soluble microbial by-product components (41.89%). The results also showed that fertilization had no significant effect on soil TOC, ROC, and LOC, but it notably reduced the contents of DOC and POC and increased the MBC content. Compared with those under the control without fertilization, the contents of DOC and POC subjected to fertilization decreased by 35.44% and 28.33%, respectively, and the MBC content increased by 33.38%. Additionally, fertilization tended to increase the anthropogenic humus component (5.13%) and soluble microbial by-product component (29.41%) in dissolved organic matter and reduce the terrestrial humus component (13.33%). Warming and fertilization both tended to improve soil CPMI. Affected by SOC and LOC, the increase in soil carbon pool index and soil lability index were the main reason for the increase in soil CPMI under warming and fertilization, respectively. Overall, the results revealed that climate warming can affect the soil carbon pool by changing soil labile carbon components, which are not affected by fertilization. |
|
|
|
