| 引用本文: | 甘国渝,陈曦,朱海,等.水热耦合对不同利用类型土壤磷生物有效性的影响[J].灌溉排水学报,2022,():-. |
| ganguoyu,Chen Xi,Zhu Hai,et al.水热耦合对不同利用类型土壤磷生物有效性的影响[J].灌溉排水学报,2022,():-. |
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| 水热耦合对不同利用类型土壤磷生物有效性的影响 |
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甘国渝, 陈曦, 朱海, 金慧芳, 李燕丽, 李继福
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长江大学
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| 摘要: |
| 【目的】基于磷的生物有效性分析方法，研究水分、温度及其耦合效应对常见利用类型土壤磷素组分及Olsen-P含量的影响。【方法】采用室内模拟培养试验，以临近区域内的稻田、旱地、菜地和林地4种土壤为研究对象，设定3个水分（W）比例：40%、70%和100%的质量含水率，分别记为W40、W70和W100；3个温度（T）：15℃、25℃和35℃，分别记为T15、T25和T35，进行连续15 d恒温培养研究。根据生物有效性的土壤磷分级方法（biologically-based P，BBP）对各处理土壤进行磷分级和测定。【结果】同一温度和水分条件下，稻田、旱地、菜地和林地土壤的生物有效性磷素含量及Olsen-P含量从高到低依次为林地>菜地>旱地>稻田。温度恒定时，土壤水分含量与4类土壤中HCl-P、Citrate-P、Enzyme-P和Olsen-P含量呈极显著正相关。恒定土壤水分含量时，温度与4类土壤中HCl-P和Olsen-P含量呈极显著正相关，与Citrate-P含量呈显著负相关，而与Enzyme-P含量无明显相关性，但Enzyme-P含量在35℃达到最高值。稻田、旱地、菜地和林地土壤中Olsen-P含量与HCl-P和Enzyme-P含量呈正相关，与Citrate-P和CaCl2-P含量呈负相关。方差分析结果表明，稻田、旱地、菜地和林地土壤的各磷素含量与温度（T）、水分（W）及水温交互（T*W）作用的差异显著性表现为T>W>T*W。【结论】增加土壤含水率可提高各类土壤中HCl-P、Citrate-P、Enzyme-P和Olsen-P含量；土壤温度增加有助于提高HCl-P和Olsen-P含量，并引起Citrate-P含量下降。稻田、旱地、菜地和林地土壤中的CaCl2-P含量、菜地中的Enzyme-P含量受水热交互效应显著，其它组分受影响并不明显。因此，一定土壤温度和水分范围内，温度和水分在不同类型土壤磷生物有效性组分上具有正向耦合效应，并显著影响着土壤的供磷水平和能力。 |
| 关键词: 土壤磷；水分；温度；生物有效性；耦合效应 |
| DOI： |
| 分类号:S-3 |
| 基金项目:湿地生态与农业利用教育部工程研究中心开放基金(No. KF202015)资助。 |
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| Effects of Hydrothermal Coupling on phosphorus bioavailability in different utilization types of soils |
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ganguoyu, Chen Xi, Zhu Hai, Jin Huifang, Li Yanli, Li Jifu
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Yangtze University
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| Abstract: |
| 【Background】 Based on the phosphorus (P) bioavailability analysis method, the effects of moisture, temperature and their coupling effect on the soil P components and Olsen-P content were carried out in common utilization types of soil. 【Method】 The simulated culture experiment was employed, and four types of soil were selected as the research object (paddy field, upland, vegetable field and forest land in the adjacent area). Three moisture (W) ratios were set: 40%, 70% and 100% field saturated water content, which were recorded as W40, W70 and W100, respectively; Three temperatures (T): 15℃, 25℃ and 35℃ were recorded as T15, T25 and T35, respectively. The study was incubated for 15 days in lab. The P components of each soil was classified and determined according to the classification method of soil P bioavailability (biologically based P, BBP). 【Result】Under the same temperature and moisture conditions, the contents of bioavailable P and Olsen-P in the paddy field, upland, vegetable field and forest land soils were ordered as: forest land > vegetable land > upland > paddy field. When the temperature was constant, the soil water content was positively correlated with the contents of HCl-P, Citrate-P, Enzyme-P and Olsen-P in four types of soils. When the soil moisture content was constant, the temperature had a very significant positive correlation with the content of HCl-P and Olsen-P in the four types of soil, a significant negative correlation with the content of Citrate-P, but had no significant correlation with the content of Enzyme-P, but the content of Enzyme-P reached the highest value at 35℃. The content of Olsen-P in paddy field, dry land, vegetable field and forest land was positively correlated with the content of HCl-P and Enzyme-P, and negatively correlated with the content of Citrate-P and CaCl2-P. The results of analysis of variance showed that there were significant differences in the interaction of phosphorus content with temperature (T), moisture (W) and temperature & moisture interaction (T * W) in paddy field, dry land, vegetable field and forest land, as follows: T > W > T * W. 【Conclusion】 Increasing soil moisture content can increase the contents of HCl-P, Citrate-P, Enzyme-P and Olsen-P in various soils; The increase of soil temperature was helpful to increase the contents of HCl-P and Olsen-P, and caused the decrease of Citrate-P. The contents of CaCl2-P and Enzyme-P in paddy field, dry land, vegetable field and forest land were significantly affected by water and heat interaction, while other components were not significantly affected. Therefore, within a certain range of soil temperature and water, temperature and moisture have a positive coupling effect on phosphorus bioavailability components of different types of soil, and significantly affect the phosphorus supply level and capacity of soil. |
| Key words: Soil phosphorus; Soil moisture; Temperature; P bioavailability; Coupling effect |
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