放牧和施肥模式对轻度退化天然羊草草原羊草叶钙、铁、锌含量的影响

doi:10.12190/j.issn.2096-1197.2022.04.12

Abstract

Abstract:

【Objective】To investigate a more sensible grazing and fertilization mode in mildly degraded natural Leymus chinensisgrassland and to serve as a guide for raising the quality of the forage.【Methods】In a random block design,the plant height,leaf fresh weight and leaf Ca,Fe,and Zn content were measured under various grazing conditions including different grazing intensity[no grazing(CK),light grazing,medium grazing,and heavy grazing],different grazing modes[no grazing(CK),cattle herding alone,sheep herding alone,mixed grazing of cattle and sheep],as well as different fertilization modes[no fertilizer(CK),NPK compound fertilizer,humic acid fertilizer,ammonium nitrate].【Results】Heavy grazing increased the Fe content of Leymus chinensis leaves by 76% compared with CK(P<0.05). Cattle herding alone,sheep herding alone,mixed grazing of cattle and sheep increased the Fe content in Leymus chinensis leaves by 36%,174%,and 164% compared with CK(P<0.05). The Ca,Fe,and Zn content in Leymus chinensis leaves were unaffected by light or medium grazing,application of NPK compound fertilizer,humic acid fertilizer,or ammonium nitrate. In comparison with CK,applying 75,150,225 kg/hm² NPK compound fertilizer and 1 500 kg/hm² humic acid,the plant height of Leymus chinensis rose by 10.0%,22.1%,28.5%,and 13.0%,respectively. When 150 and 225 kg/hm² NPK compound fertilizer were applied,the fresh weight of Leymus chinensis rose by 35.0% and 63.0%,respectively(P<0.05). The application of 75 kg/hm² of NPK compound fertilizer 1 500 kg/hm² of humic acid and in comparison with CK had no significant impact on the fresh weight of Leymus chinensis(P>0.05). The application of varying concentrations of ammonium nitrate had no significant effect on Leymus chinensis plant height and fresh weight(P>0.05).【Conclusion】For mildly degraded natural Leymus chinensis grassland heavy grazing,cattle herding alone,sheep herding alone,and mixed grazing of cattle and sheep all encouraged the accumulation of Fe content in the leaves of Leymus chinensisand improved the feeding quality of Leymus chinensis. Applying NPK compound fertilizer and humic acid boosted the increase in plant height and fresh weight of Leymus chinensis.

Key words: Natural Leymus chinensis grassland, Leymus chinensis, Grazing intensity, Grazing mode, Fertilization mode, Ca, Fe, Zn

CLC Number:

S688.4

YAN Chunxia, ZHAO Man, LI Hao, ZHANG Lin, ZHANG Xiaoyan, QI Zhi. Effects of different grazing and fertilization modes on Ca,Fe and Zn contents in leaves of Leymus chinensis in mildly degraded natural Leymus chinensis grassland[J].Journal of Northern Agriculture, 2022, 50(4): 83-95.

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References 62

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Effects of different grazing and fertilization modes on Ca,Fe and Zn contents in leaves of Leymus chinensis in mildly degraded natural Leymus chinensis grassland

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