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土壤遗留和亚热带草原的损失风险

Ran Zhi¹, Elizabeth H Boughton², Haoyu Li²

¹School of Natural Resources and Environment, University of Florida, Gainesville, FL, USA; Fort Lauderdale Research and Education Center, University of Florida, Davie, Florida, USA.

Journal of environmental management

|July 9, 2024

概括

佛罗里达州草原的土壤遗留 (P) 积累在空间上是可变的. 大多数半原生牧场作为P沉没,减少P损失的风险,由于土壤的特性,如有机物质.

科学领域:

农业生态系统管理管理
土壤科学土壤科学
环境化学环境化学

背景情况:

来自历史肥料的遗留 (P) 挑战了农业生态系统管理和水质.
佛罗里达州的亚热带草原,特别是用于牛犊作业的草原,面临着P积累的挑战.
了解遗留P的空间分布和风险对于可持续的土地管理至关重要.

研究的目的:

调查佛罗里达州亚热带草原的土壤遗产P的空间分布和风险评估.
为了比较改善与半原生牧场的遗留P动态.
确定影响土壤P储能和P损失风险的因素.

主要方法:

从1438个地点收集了改善和半本土牧场的土壤样本.
分析了总P和Mehlich-1P度.
计算了土壤P储存能力 (SPSC),并将其纳入指数 (PI) 进行空间风险评估.
利用空间随机森林建模来确定SPSC的关键预测因素.

主要成果:

观察到土壤遗留P的实质空间变化,总P在11.46至619,54毫克/公斤之间.
半原生牧场经常充当P水槽 (阳性SPSC),与高,铁和有机物质含量有关.
高度,土壤有机物,储水,牧场类型,pH值和土壤秩序是SPSC的重要预测因素.
在SPSC考虑时,只有3%的研究区域显示高或非常高的PI风险类别.

结论:

土壤遗留的P动态是复杂的,SPSC在调节P损失风险方面发挥着关键作用.
半原生牧场表现出更高的保留P的能力,减轻了与高土壤P水平相关的风险.
将SPSC纳入风险评估的整体方法对于优化农业实践和确保可持续草原管理至关重要.

关键词:

农业实践农业实践农业实践佛罗里达州佛罗里达州佛罗里达州佛罗里达州遗留的是一种遗留的.含量指数是指含量的指数.土壤储存能力土壤储存能力亚热带草原是一个亚热带草原.

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