典型草原降水梯度下合理放牧对土壤养分的影响
文献类型: 中文期刊
关键词: 放牧;;土壤养分;;草畜平衡区;;禁牧区
期刊名称:中国草地学报
ISSN: 1673-5021
年卷期: 2025 年
页码:
收录情况: 北大核心(2023版) ; ; CSCD(2025-2026年度) ; ; 科技核心(2024版) ; ; 农林核心(2024版)
摘要: 长期以来,典型草原承受着高强度的放牧压力,导致草地生物多样性和生态系统服务功能退化。合理放牧能够促进草地生态系统养分循环,提高土壤养分含量,但放牧对典型草原区土壤养分含量的影响研究仍显不足。本研究以内蒙古自治区呼伦贝尔市5个典型草原区为研究对象,设置草畜平衡区(载畜量在0.6~1.5羊单位/hm2)和禁牧区对比试验,分析不同土层土壤养分含量的变化,探讨其对放牧的响应及与气候因子的关系。结果表明:草畜平衡区土壤养分指标(有机碳、全氮、全磷、全钾和速效磷)含量普遍高于禁牧区;在干燥度指数较低的样点,放牧对0~30 cm土层的有机碳、全氮含量表现出正效应;土壤主要养分指标的放牧响应比与气候因子密切相关,其中土壤全氮、速效磷的放牧响应比和干燥度指数呈显著正相关,土壤全磷的放牧响应比与干燥度指数呈极显著正相关,而各养分指标的放牧响应比与降水量均呈负相关。综上,在典型草原,合理放牧对提高土壤养分含量具有重要作用。
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