Predicted effects of simulated ambient warming and moisture on forage nutrient quality and community composition in Mongolian an arid grassland
Predicted effects of simulated ambient warming and moisture on forage nutrient quality and community composition in Mongolian an arid grassland
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模拟环境变暖和湿度对蒙古干旱草原牧草养分质量和群落组成的影响预测
DOI：
10.1071/rj22027
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
T
中科院分区：
文献类型：
--
作者：
Yoshihara;Y.;Aoki;R.;Kinugasa;T.;Sasaki;T
放牧草原上可持续的牧草和畜牧业生产受到全球气候变化的威胁。在这项研究中，我们研究了蒙古旱地物种和群落水平上的牧草质量如何受到气候变暖和额外水分的影响。在田间设置了4种不同的处理，即对照、仅开顶室(OTCs)、加热器OTCs和额外浇水的OTCs，并监测了空气和土壤温度和土壤水分。进行了植被调查，并在夏季、试验处理建立后1年和2年进行了植物收获。采集的植物样本被分成优势种(Stipa)或其他种，并进行分析以测定酸性洗涤纤维(ADF)和体外干物质消化率(IVDMD)。ADF测定采用洗涤剂法，消化率测定采用胃酶-纤维素酶测定法。总体而言，仅增温处理(OTC和OTC加加热器)在物种和群落水平上分别比对照增加ADF 10%和5%，而在群落水平上降低消化率12%和11%。植物营养价值的变化可能是由于所监测的一些或所有植物物种的植物结构发生变化，以及由于气候变暖导致植物物种组成变化的间接影响。与潮湿的草原不同，干旱草原上的草营养对与植物营养变化相关的全球变暖预测影响相关的处理很敏感。因此，蒙古畜牧业生产极有可能因持续的全球变暖而受到负面影响。
Sustainable forage and livestock production in grazed grasslands are threatened by global climatic change. In this study, we examined how forage quality at the species and community levels in Mongolian drylands might be affected by warming and additional moisture. Four different treatments, a control, open-top chambers (OTCs) only, OTCs with heaters, and OTCs with additional watering, were set up in the field, and air and soil temperature and soil moisture were monitored. A vegetation survey was conducted and plants were harvested during summer, 1 and 2years after experimental treatments were established. The harvested plant samples were separated into a dominant species (Stipa) or ‘other species’, and analysed to determine acid detergent fibre (ADF) and in vitro dry-matter digestibility (IVDMD). ADF was measured with the detergent method and the digestibility with the pepsin–cellulase assay. Overall, the warming treatments alone (OTC and OTC with heater) increased ADF 10% and 5% more than did the control at the species and community levels respectively, and decreased digestibility 12% and 11% below the control at the community level. Changes in plant nutritional value may have occurred as a result of changes in plant structure for some or all the plant species monitored, and an indirect effect of the shift in botanical species composition owing to warming. Unlike moist grassland, grass nutrition in arid grasslands was sensitive to treatments associated with the predicted effects of global warming as the results of changes in plant nutrition. It is therefore highly possible that Mongolian livestock production will be negatively affected as a result of ongoing global warming.