| 赵满兴,张霞,杨帆,马卓,马文全.陕北中部黄土区不同种植年限水稻田有机碳矿化对温度的响应[J].干旱地区农业研究,2024,(2):41~52 |
| 陕北中部黄土区不同种植年限水稻田有机碳矿化对温度的响应 |
| Response of organic carbon mineralization of paddy soil with different planting years to temperature in loess area of central of Northern Shaanxi Province |
| |
| DOI：10.7606/j.issn.1000-7601.2024.02.06 |
| 中文关键词: 水稻田 种植年限 有机碳矿化 温度 陕北中部 |
| 英文关键词:paddy soil planting years organic carbon mineralization temperature changes central of Northren Shaanxi Province |
| 基金项目:国家自然科学基金（41761068）；陕西省自然科学基础研究面上项目（2024JC-YBMS-239） |
|
| 摘要点击次数: 252 |
| 全文下载次数: 194 |
| 中文摘要: |
| 为了探讨陕北中部黄土区不同种植年限水稻田有机碳矿化对温度的响应, 以陕北南泥湾水稻种植基地不同种植年限（3 、30 、78 a）的稻田土壤为研究对象，基于室内35 d培养试验与矿化动态模型研究方法，解析温度对土壤有机碳矿化的影响。结果表明：土壤有机碳累积矿化量和矿化速率均表现为78 a水稻田>30 a水稻田>3 a水稻田>玉米田。土壤累积矿化量、矿化速率、潜在可矿化有机碳含量（C0）和潜在可矿化有机碳占总有机碳的比值（C0/SOC）均表现为30℃处理>20℃处理>10℃处理。水稻田矿化累积量均表现为10℃处理（2 015.14 mg·kg-1）显著低于20℃（2 799.20 mg·kg-1）和30℃处理（3 078.47 mg·kg-1）（P<0.05），但20℃与30℃处理之间无显著差异。玉米田累积矿化量在不同培养温度间没有达到显著差异水平。0~20 cm土层累积矿化量是20~40 cm土层的1.18倍。供试土壤在温度从10℃升高到20℃时的温度系数（Q10）值（1.38）均高于从20℃升高到30℃时的Q10值（1.14），土层间的Q10值大小关系为0~20 cm>20~40 cm。潜在可矿化有机碳含量C0与总有机碳、易氧化有机碳及溶解性有机碳含量之间均呈正相关关系，C0与微生物生物量碳含量间呈正相关关系但未能达到显著水平。C0/SOC随水稻种植年限的增加而降低，说明土壤有机碳的固存能力随水稻种植年限的增加而增强。 |
| 英文摘要: |
| To explore the response of organic carbon mineralization in paddy soil with different planting years to temperature, the rice field soil samples with different planting years (3, 30, 78 a) were collected at the Nanniwan Rice Planting Base in the typical loess hilly and gully regions of Northern Shaanxi Province. The characteristics and differences of organic carbon mineralization were measured through indoor 35-day cultivation experiments and mineralization dynamic models between paddy and dry land soils. Temperature changes had a significant impact on organic carbon mineralization. The main results were as follows: the cumulative mineralization amount and mineralization rate of soil organic carbon under different tillage years were shown as 78 a paddy soil>30 a paddy soil>3 a paddy soil>maize soil. The cumulative mineralization amount, mineralization rate, potential mineralizable organic carbon content (C0) and the ratio of potential mineralizable organic carbon to SOC (C0/SOC) were shown as 30℃>20℃>10℃. The accumulation of organic carbon mineralization in paddy soil showed a significant decrease at 10℃(2 015.14 mg·kg-1) compared to 20℃ (2 799.20 mg·kg-1) and 30℃(3 078.47 mg·kg-1) (P<0.05), but there was no significant difference between 20℃and 30℃. The accumulated mineralization amount of organic carbon in the 0~20 cm soil layer was 1.18 times that in the 20~40 cm soil layer. The temperature coefficient (Q10) was higher under temperature increased from 10℃ to 20℃(Q10 value was 1.38) when relative to the temperature increased from 20℃ to 30℃(Q10 value was 1.14), and the order of Q10 values under different layers as follows: 0~20 cm>20~40 cm. The potential mineralizable organic carbon content C0 had a significant positive correlation with TOC, easily oxidized organic carbon and dissolved organic carbon. The relationship between C0 and microbial biomass carbon indicated a positive correlation, but not reached a significant level. C0/SOC decreased with the improve of rice planting years, indicating that the soil organic carbon sequestration capacity be enhanced with the rice planting years. |
| 查看全文 查看/发表评论 下载PDF阅读器 |