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| 1 | Plant phenological responses to climate change on the Tibetan Plateau: research status and challenges显示文摘Phenology studies the cycle of events in nature that are initiated and driven by an annually recurring environment. Plant phenology is expected to be one of the most sensitive and easily observable natural indicators of climate change. On the Tibetan Plateau(TP), an accelerated warming since the mid-1980 s has resulted in signiicant environmental changes. hese new conditions are accompanied by phenological changes that are characterized by considerable spatiotemporal heterogeneity. Satellite remote sensing observed widespread advance in the start of the plant growing season across the plateau during the 1980 s and 1990 s but substantial delay over 2000–2011 in the southwest although it continued to advance in the northeast regions of the TP. Both observational studies and controlled experiments have revealed, to some extent, the positive role of higher preseason temperature and even more precipitation in advancing the leaf onset and irst lowering date of the TP. However, a number of rarely visited research issues that are essential for understanding the role of phenology in ecosystem responses and feedback processes to climate change remain to be solved. Our review recommends that addressing the following questions should be a high priority. How did other phenological events change, such as lowering and fruiting phenology? What are the inluences from environmental changes other than temperature and precipitation, including human activities such as grazing? What are the genetic and physiological bases of plants phenological responses?How does phenological change inluence ecosystem structure and function at diferent scales and feedback to the climate system? Investigating these research questions requires, irst of all, new data of the associated environmental variables, and consistent and reliable phenological observation using diferent methodologies(i.e. in situ observations and remote sensing). | Miaogen Shen Shilong Piao Tsechoe Dorji Qiang Liu Nan Cong Xiaoqiu Chen Shuai An Shiping Wang Tao Wang Gengxin Zhang | 2015 | National Science Review2015，2，4： | 13 |
| 2 | Emerging Negative Warming Impacts on Tibetan Crop Yield显示文摘Preserving Tibet’s unique history and cultural heritage relies on the sustainability of the Tibetan croplands,which are characterized by highland barley,the only cereal crop cultivated over 4000 m above sea level.Yet it is unknown how these croplands will respond to climate change.Here,using yield statistics from 1985 to 2015,we found that the impact of temperature anomalies on the Tibetan crop yield shifted from nonsignificant(P>0.10)in the 1980s and 1990s to significantly negative(P<0.05)in recent years.Meanwhile,the apparent sensitivity of the crop yield to temperature anomalies almost doubled,from(–0.13±0.20)to(–0.22±0.14)t·ha^(-1)℃^(–1).The emerging negative impacts of higher temperatures suggest an increasing vulnerability of Tibetan croplands to warmer climate.With global warming scenarios of+1.5 or+2.0℃above the pre-industry level,the temperature sensitivities of crop yield may further increase to(–0.33±0.10)and(–0.51±0.18)t·ha^(-1)℃^(–1),respectively,making the crops 2–3 times more vulnerable to warmer temperatures than they are today. | Tsechoe Dorji Shilong Piao Xuhui Wang Chuang Zhao Baohua Liu Anping Chen Shiping Wang Tao Wang | 2022 | Engineering2022，8，7： | 2 |
| 3 | 增温和放牧对高寒草甸凋落物分解及其养分释放的影响不依赖于凋落物品质显示文摘在放牧生态系统中,增温、放牧和调落物品质共同决定着凋落物分解和养分释放。然而,在以往的研究中这些因子的效应通常被单独地研究。在本研究中,我们在青藏高原高寒草甸开展了一个昼夜非对称增温和中度放牧两因子的调落物分解试验。从每个处理中收集了调落物样品,这些调落物一部分放在它们的来源处理小区,另一部分放在其他处理小区以此来探究增温、放牧以及调落物品质对调落物分解和养分释放的影响。研究结果表明,增温而不是放牧显著增加了调落物质量的损失、单位面积全碳、全氮以及全磷含量的损失,这主要是因为增温增加了落物生物量和分解速率。然而,尽管同时增温放牧处理也加快了调落物分解速率,但由于降低了调落物生物量,所以增温放牧处理并没有显著影响单位面积的凋落物碳和养分释放量。相比木质素含量和碳氮比而言,季节性土壤平均温度能够更好地预测调落物分解速率。增温和放牧对调落物分解存在交互作用,但它们和调落物品质对调落物的影响均不存在交互作用。单位面积的总氮释放的温度敏感性要高于总磷。因此,我们的结果表明,增温对调落物分解以及养分释放的影响要显著大于调落物品质变化对其分解的影响。在高寒草甸,氮释放的增加可能会间接导致土壤磷有效性的缺乏。 | Bowen Li Wangwang Lv Jianping Sun Lirong Zhang Lili Jiang Yang Zhou Peipei Liu Huan Hong Qi Wang Wang A Suren Zhang Lu Xia Zongsong Wang Tsechoe Dorji Ailing Su Caiyun Luo Zhenhua Zhang Shiping Wang | 2022 | Journal of Plant Ecology2022，15，5： | 1 |
| 4 | 高山嵩草植物群落花期物候对增水的响应比对恒定增温和逐步增温的响应更敏感显示文摘有研究表明长期观测的植物花期物候变化温度敏感性与野外控制恒定增温试验所得出的花期物候温度敏感性结果不一致,这可能是由于两种观测方法具有不同的增温模式引起的。因为长期观测的气候变暖实际上是气温逐渐升高的情景,而野外控制增温试验所增加的温度是突然增加且每年保持不变。不同的增温模式是否会导致不同的结果目前还缺乏野外试验证据。此外,不同增温模式的效应还受到降水变化的调控。因此,我们于2015–2018年在高寒高山嵩草草甸开展了一项恒定增温(和对照相比,每年保持恒定增温1°C)和逐步增温(和对照相比,2015年增温0.25°C,以后逐年在前一年基础上再增温0.25°C,到2018年相比对照增温1°C)以及与增水(100%/50%)耦合的野外控制试验。研究结果发现,增温模式并没有显著改变群落花期物候。然而,增水显著提前了早花植物和中花植物的初花期,提前了早花植物的末花期,推迟了中花植物的末花期。增水处理并没有显著改变早花植物的开花持续期,但却显著延长了中花植物的开花持续期,进而延长了该群落的开花持续期。增温速率和增水处理并没有显著的交互作用。前一年的干旱会显著抑制第二年该植物群落的现存最大开花数。因此,无论增温模式如何,降水的改变对该高山嵩草植物群落花期物候的影响要大于增温对其的影响。 | Bowen Li Jianping Sun Shiping Wang Wangwang Lv Yang Zhou Peipei Liu Qi Wang Wang A Suren Zhang Lu Xia Huan Hong Lili Jiang Caiyun Luo Zhenhua Zhang Shilong Piao Yanfen Wang Tsechoe Dorji | 2023 | Journal of Plant Ecology2023，16，2： | 0 |
| 5 | 增温和放牧对高寒草甸植物细根的分解和养分丧失具有叠加效应显示文摘细根的分解是调控生态系统碳循环,影响养分循环以及土壤肥力的关键过程。然而,在自然生态系统中关于增温和放牧影响细根分解的研究十分匮乏。本研究利用非对称增温(即:昼夜和季节性不对称)和适度放牧(约50%饲草利用率)的两因素野外控制试验,探讨增温和放牧对青藏高原高寒草甸为期两年的细根分解和养分丧失的影响。增温和放牧通过提高细根分解促进了碳的循环,并影响了元素循环,但各元素的循环特征各自不同。增温和放牧对细根分解和养分丧失的影响是叠加的。试验两年期间,增温和放牧显著提高了细根累积生物量和总有机碳的丧失量。仅增温并放牧处理显著降低了氮元素百分率丧失量,而无论放牧与否,增温显著降低了磷元素苞粉率丧失量。与对照比较,仅增温或放牧提高了钾、钠、钙、镁的百分率丧失量。增温和放牧对细根分解和养分丧失未呈现交互影响。降低磷丧失较减低氮丧失对温度更加敏感。在未来变暖情景下,细根分解产生的不同养分百分率丧失对温度的敏感性差异可能调整不同养分在土壤中的有效率,进而影响生态系统的结构和功能。 | Yang Zhou Wang-Wang Lv Shi-Ping Wang Li-Rong Zhang Jian-Ping Sun Li-Li Jiang Pei-Pei Liu Qi Wang Bo-Wen Li AWang Huan Hong Su-Ren Zhang Lu Xia Nan Ji Zheng-Xin Xie Cai-Yun Luo Zhen-Hua Zhang Chang-Hui Wang Jin-Zhi Wang Ci Yang Tsechoe Dorji | 2022 | Journal of Plant Ecology2022，15，6： | 0 |
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