|
| 丹江口库区旱地土壤磷淋溶阈值影响因素及其预测 |
| Factors that affect phosphorus leaching threshold and its prediction in dryland soils of Danjiangkou Reservoir area |
| 投稿时间：2023-10-26 |
| DOI：10.13254/j.jare.2023.0664 |
| 中文关键词: 农田土壤，淋溶阈值，土壤性质，路径分析 |
| 英文关键词: cultivated soil, phosphorus leaching threshold, soil property, pathway analysis |
| 基金项目:国家自然科学基金面上项目（42077067）；华中农业大学大学生科技创新基金项目（2021085） |
|
| 摘要点击次数: 690 |
| 全文下载次数: 436 |
| 中文摘要: |
| 为探究丹江口库区旱地土壤磷淋溶流失机制及其淋溶阈值的预测，以丹江和汉江的4个小流域为研究区，共采集研究区内20个典型旱作耕地土壤，测定其理化性质与土壤磷吸附特征参数，并通过室内培养试验获得土壤磷淋溶阈值（Phosphorusleaching threshold，Plth），通过路径分析探究了不同土壤Plth对土壤性质及磷吸附特性的响应，采用主成分分析探究了Plth的主控因子，并依此对其进行预测。结果表明：研究区土壤Plth范围在16.34~93.84 mg·kg-1之间，部分样点土壤速效磷（Olsen-P）含量接近甚至高于其Plth，具有极大流失风险。相关性分析表明，Plth是众多土壤性质共同作用的结果，与土壤pH呈极显著负相关（R2=0.81，P<0.001），与土壤总磷（Total phosphorus，TP）、水溶性磷（Water-soluble phosphorus，Pd）和Olsen-P含量呈显著正相关（R2>0.62，P<0.01），并受到土壤磷吸附饱和度（DPS）、零点吸持平衡浓度（EPC0）的显著影响（R2>0.51，P<0.05），在一定程度上也受到胶结物质，如土壤有机质（SOM）和游离态铁铝氧化物（Fed、Ald）的影响。路径分析中，Plth对DPS、pH和Pd的响应更为敏感，总效应系数分别为-0.90、-0.81和0.80，其中，pH影响磷吸附解吸过程的间接效应（-0.49）超过其直接效应（-0.32）。主成分分析表明土壤pH和Olsen-P是影响Plth的最主要因子，可通过多元线性回归方程对丹江口库区旱地土壤Plth进行有效预测。研究表明：Plth对DPS、pH和Olsen-P含量的响应更为敏感，土壤pH和Olsen-P含量是Plth的主控因素，可依此对其进行预测。 |
| 英文摘要: |
| To investigate the mechanism of phosphorus leaching and loss in dryland soils in Danjiangkou Reservoir area and prediction of its leaching threshold（Plth）, 20 typical dryland cultivated soils were collected from four sub-basins of Danjiang River and Hanjiang River as the study area, and their physicochemical properties and soil phosphorus adsorption parameters were determined. Plth values were obtained using the indoor incubation test, the response of different soil Plth values to soil properties and phosphorus adsorption characteristics was investigated using path analysis, and the main controlling factors of Plth were investigated and predicted using principal component analysis. The results showed that soil Plth in the study area ranged from 16.34 mg·kg-1 to 93.84 mg·kg-1, and the content of quick-acting phosphorus（Olsen-P）in some soils was close to or even higher than their Plth, which had a great risk of erosion. Correlation analysis showed that Plth was the result of the joint action of many soil properties, and it was significantly negatively correlated with soil pH （R2=0.81, P<0.001）, significantly positively correlated with soil total phosphorus（TP）, water-soluble phosphorus（Pd）, and Olsen-P content（R2>0.62, P<0.01）, and significantly affected by soil phosphorus saturation（DPS）and zero point adsorption equilibrium（EPC0）（R2>0.51, P<0.05）. To some extent, Plth was also affected by cementing materials such as soil organic matter and free-state iron and aluminum oxides（Fed and Ald）; in the path analysis, Plth was more sensitive to the response of DPS, pH, and Pd, with total effect coefficients of -0.90, -0.81, and 0.80, respectively, of which the indirect effect of the pass through of pH influencing the process of phosphorus adsorption and desorption（-0.49）exceeded the direct effect（-0.32）. The principal component analysis showed that soil pH and Olsen-P were the most important factors that affected Plth, which could be effectively predicted using the multiple linear regression equation for dryland soil Plth in the Danjiangkou Reservoir area. The study showed that Plth was more sensitive to DPS, pH, and Olsen-P content; soil pH and Olsen-P content were the main controlling factors of Plth, which could be predicted accordingly. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
