Critical review of the impacts of grazing intensity on soil organic carbon storage and other soil quality indicators in extensively managed grasslands.
Critical review of the impacts of grazing intensity on soil organic carbon storage and other soil quality indicators in extensively managed grasslands.
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DOI：
10.1016/j.agee.2017.10.023
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发表时间：
2018-02-01
期刊：
影响因子：
--
通讯作者：
Smith P
中科院分区：
文献类型：
--
作者：
Abdalla M;Hastings A;Chadwick DR;Jones DL;Evans CD;Jones MB;Rees RM;Smith P
放牧对土壤有机碳的影响与气候有关。放牧增加了C4草地的有机碳含量，降低了C3和C3-C4混合草地的有机碳含量。放牧增加了土壤TN和BD，但对土壤ph没有影响。放牧强度（GI）对草地农业生态系统土壤有机碳（SOC）储量和土壤质量指标有重要影响。为了对此进行批判性研究，我们对83项关于广泛放牧的研究进行了全球回顾和荟萃分析，涵盖了不同国家和气气带的164个地点。与之前发表的评论不同，我们将SOC和总氮（TN）数据归一化到30 cm深度，以与IPCC指南兼容。我们还计算了归一化GI，并根据区域气候将数据分为四大类（干暖，DW；干冷，DC；湿暖，MW；湿冷，MC）。我们的研究结果表明，在所有气候带和地理信息系统中，放牧（低于系统的承载能力）导致有机碳储量减少，尽管其对有机碳的影响依赖于气候。在不同的区域气候条件下，所有GI水平的碳储量都在MW气候条件下增加（+7.6%），而在MC气候条件下减少（- 19%）。在DW和DC气候条件下，只有低（+5.8%）和中低（+16.1%）放牧强度与土壤有机碳储量增加相关。与c3为主草地和C3-C4混合草地相比，高GI显著提高了c4为主草地的有机碳含量。为防止草地土壤退化，建议根据气候区和草地类型（C3、C4或C3-C4混合）优化GI和管理措施。
The impact of grazing on SOC is climate-dependent. Grazing increases SOC for C4 but decreases it for C3 and C3-C4 mixed grasslands. Grazing increases TN and BD but has no effect on soil pH. Livestock grazing intensity (GI) is thought to have a major impact on soil organic carbon (SOC) storage and soil quality indicators in grassland agroecosystems. To critically investigate this, we conducted a global review and meta-analysis of 83 studies of extensive grazing, covering 164 sites across different countries and climatic zones. Unlike previous published reviews we normalized the SOC and total nitrogen (TN) data to a 30 cm depth to be compatible with IPCC guidelines. We also calculated a normalized GI and divided the data into four main groups depending on the regional climate (dry warm, DW; dry cool, DC; moist warm, MW; moist cool, MC). Our results show that taken across all climatic zones and GIs, grazing (below the carrying capacity of the systems) results in a decrease in SOC storage, although its impact on SOC is climate-dependent. When assessed for different regional climates, all GI levels increased SOC stocks under the MW climate (+7.6%) whilst there were reductions under the MC climate (−19%). Under the DW and DC climates, only the low (+5.8%) and low to medium (+16.1%) grazing intensities, respectively, were associated with increased SOC stocks. High GI significantly increased SOC for C4-dominated grassland compared to C3-dominated grassland and C3-C4 mixed grasslands. It was also associated with significant increases in TN and bulk density but had no effect on soil pH. To protect grassland soils from degradation, we recommend that GI and management practices should be optimized according to climate region and grassland type (C3, C4 or C3-C4 mixed).
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DOI：
10.2307/4002692
发表时间：
1996-03-01
期刊：
JOURNAL OF RANGE MANAGEMENT
影响因子：
--
作者：
Chaneton, EJ;Lavado, RS
通讯作者：
Lavado, RS
影响因子：
4.9
作者：
Barnard, R;Barthes, L;Leadley, PW
通讯作者：
Leadley, PW
影响因子：
5
作者：
Flaspohler, DJ;Temple, SA;Rosenfield, RN
通讯作者：
Rosenfield, RN
影响因子：
9.4
作者：
Cornelissen, JHC;Pérez-Harguindeguy, N;Cerabolini, B
通讯作者：
Cerabolini, B
影响因子：
2.9
作者：
Dong, S. K.;Wen, L.;Li, X. Y.
通讯作者：
Li, X. Y.