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| 1 | Long-term effects of mowing on plasticity and allometry of Leymus chinensis in a temperate semi-arid grassland,China显示文摘Mowing is an important land management practice for natural semi-arid regions.A growing body of empirical evidence shows that different mowing regimes affect the functioning of grassland ecosystems.However,the responses of plant functional traits to long-term mowing and their allometric scaling under long-term mowing are poorly understood.For a better understanding of the effects of mowing on grassland ecosystems,we analyzed the allometric traits of leaves and stems of Leymus chinensis(Trin.) Tzvel.,a dominant grass species in eastern Eurasian temperate grassland,at different mowing intensities(no clipping,clipping once every two years,once a year and twice a year).Experiments were conducted on plots established over a decade ago in a typical steppe of Xilinhot,Inner Mongolia,China.Results showed that most of the functional traits of L.chinensis decreased with the increased mowing intensity.The responses of leaves and stems to long-term mowing were asymmetric,in which leaf traits were more stable than stem traits.Also significant allometric relationships were found among most of the plant functional traits under the four mowing treatments.Sensitive traits of L.chinensis(e.g.leaf length and stem length) were primary indicators associated with aboveground biomass decline under high mowing intensity.In conclusion,the allometric growth of different functional traits of L.chinensis varies with different long-term mowing practices,which is likely to be a strategy used by the plant to adapt to the mowing disturbances. | LI Xiliang HOU Xiangyang REN Weibo Taogetao BAOYIN LIU Zhiying Warwick BADGERY LI Yaqiong WU Xinhong XU Huimin | 2016 | Journal of Arid Land2016，8，6： | 7 |
| 2 | Understanding sheep baa-haviour: Investigating the relationship between pasture and animal grazing patterns显示文摘Background:Grasslands are the primary source of feed for grazing livestock,and as such,knowledge on how to best manage livestock and grasslands,through the use of spatiotemporal modelling,will assist in the long-term management of a valuable ecosystem resource.Methods:This study was conducted over 14 months between March and April 2017 in Orange,NSW,Australia.The study evaluated sheep behaviour in relation to the presence of pasture species,environment and paddock structures,using random forest modelling,to predict sheep location under continuous high(HSR,13 DSE ha−1)and low(LSR,7DSE ha−1)stocking rates.Results:In the LSR,significant drivers included water,shade and fence lines(p<0.01).In the HSR,only fence lines and available biomass were found to be significant(p<0.01).The presence of green legumes in both stocking rates often increased residency by sheep.Animals spent more time together in the LSR,suggesting that social behaviour played a larger role than pasture quantity and quality in driving grazing behaviours.Conclusions:Understanding how pasture type can influence grazing behaviours and also how animal behaviour affects pasture performance and utilisation is important in developing long-term sustainable management strategies on a paddock scale. | Danica Parnell Igor Kardailsky Jacob Parnell Warwick Brabazon Badgery Lachlan Ingram | 2022 | Grassland Research2022，1，3： | 0 |
| 3 | SGM模型牦牛子模型生长发育模块校验及应用显示文摘基于前期构建的Sustainable Grassland Model(SGM)模型框架,选用并改进GRAZPLAN动物模型和不完全小区模拟方法,在MATLAB平台对SGM模型进行二次开发,建立牦牛子模型生长发育模块,以期为青藏高原可持续放牧生产体系的构建提供研究工具及决策支持。采用局部敏感度分析法,筛选并计算敏感度系数确定牦牛子模型生长发育模块下放牧采食量和体重变化模拟中的敏感参数,以已发表的研究数据为基础,利用最小二乘法建立敏感参数校准模型并完成模块校准,校准后运行模型,得到的增重模拟结果与前人发表的研究数据比对后进行统计分析,完成模型检验。检验后的模型以甘肃省玛曲县高寒草甸典型牦牛牧户(草地中度退化)为研究对象进行模型示范。结果表明:经参数校验后的SGM牦牛子模型在模拟牦牛放牧采食量和增重方面切实可行。示范结果证明SGM模型能够合理地模拟粗放型生产管理下放牧压力的降低对高寒草甸牦牛放牧生产体系草地地上生物量、植物群落功能组成、家畜放牧采食量和体重变化的长期影响,说明SGM模型在青藏高原高寒草甸模拟放牧压力对放牧生产体系的长期影响具有可行性。该模型采用不同的参数,基于同一套数学公式实现对放牧牛羊生长发育的模拟,在未来牛羊放牧系统模型开发中具有良好的应用前景,但需要针对模拟对象的实际实施校准,且对牦牛产奶量和放牧采食量的模拟仍需进一步开发和改进。 | 刘海波 BEHRENDT Karl 吴建平 杜文华 KEMP David BADGERY Warwick 宫旭胤 刘立山 金茜 | 2023 | 草业科学2023，40，12： | 0 |
| 4 | Editorial显示文摘It is our honor to offer you this inaugural issue of Grassland Research.Grassland is the largest terrestrial ecosystem on the earth.It produces an array of goods,including food,feed,fiber,and fuel,and ecosystem services as varied as weather amelioration,carbon sequestration,biodiversity enhancement,soil conservation,recreation,and the maintenance of the atmospheric composition.Historically,grassland has played an essential role in the development of civilization.Humans would likely be very different without their coevolution with grassland.The saying“All flesh is grass”indicates partially the relationship between humans and grassland.Currently,the world is facing many serious challenges and problems,including global warming,food shortages,water scarcity,land degradation and desertification,soil erosion,flooding,and other illnesses.These challenges will become more severe in the coming years,making the role of grasslands in our agricultural and ecological systems ever more important.Of course,grasslands cannot solve all these problems,but they can play a positive role in our future welfare.The development and application of science and technology,and the support of policy,will ensure that grasslands play a significant role in solving these problems.It is the obligation of grassland scientists together with other stakeholders to redouble our efforts to understand and improve grasslands. | Zhibiao Nan Charlie Brummer Bernhard Schmid Warwick Brabazon Badgery Zeng‐Yu Wang Jin‐Sheng He Yingjun Zhang | 2022 | Grassland Research2022，1，1： | 0 |
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