Speculation for quantifying increased C4 plants under future climate conditions: Inner Mongolia, China case study
Speculation for quantifying increased C4 plants under future climate conditions: Inner Mongolia, China case study
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对未来气候条件下 C4 植物数量增加的推测：中国内蒙古案例研究
DOI：
10.1016/j.quaint.2021.03.011
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发表时间：
2021-03
影响因子：
2.2
通讯作者：
Qiaohui Fan
中科院分区：
文献类型：
--
作者：
Xueyun Ma;Zhifu Wei;Yongli Wang;Gen Wang;Ting Zhang;He Ma;Wei He;Xiaoli Yu;Shangkun Li;Qiaohui Fan
自晚冰期以来，从冷到暖的交替条件为未来的水文气候变化提供了显著的对比，植被的相应变化也是如此。为了预测未来气候变暖条件下C3/ c4生物量的潜在变异，我们通过估算内蒙古125个表层土壤样品的δ13Corgvalues的变异，并研究内蒙古c4植物生长的地质时期变异，确定了当前C3和c4植被的时空分布。我们研究了影响c4植物生长的因素，以及近期和地质时期气温每升高1°C时c4植物的变异。结果表明：内蒙古c4植物相对丰度由西北向东南呈增加趋势；c4植物生物量与气温呈显著正相关，与降水呈微弱相关，表明温度是决定该地区c4植物生长的主要气候因子。气温每升高1°C，内蒙古现今c4植物生物量的时空变化将增加约2.1%，而地质时期则增加10.7%。相比之下，中国黄土高原现今c4生物量的时空变化对温度每升高1°C的响应增加了4.0%，而基于蓝田和荥阳剖面岩心样品的地质时期分别增加了6.0%和7.5%。有趣的是，在c4植物当前生长期，温度每升高1°C， c4生物量增加6.6%，这与地质时期结果基本一致（即蓝田和荥阳剖面分别为6.0%和7.5%）。本研究结果揭示了c4植物在近代和地质时期变化的明显对比，从而使我们能够定量估计c4植被响应预测气候条件的潜在变化。
Alternating conditions from cold to warm periods since the Late Glacial provided a significant contrast for future hydroclimatic variation, as did the corresponding variation in vegetation. To predict the potential variability in C3/C4biomass under future warmer climatic conditions, we determined the current spatiotemporal distribution of C3and C4vegetation by estimating the variability of δ13Corgvalues in 125 topsoil samples and investigating the geological period variability of C4plants growing in Inner Mongolia, China. We examined the factors contributing to the growth of C4plants and the variability in C4plants for each 1 °C increase in temperature during recent and geological times. The results revealed that the relative abundance of C4plants in Inner Mongolia shows an increasing trend from the northwest to the southeast. The biomass of C4plants was found to be positively correlated with temperature, although weakly correlated with precipitation, thereby indicating that temperature is the primary climatic factor determining the growth of C4plants in this region. Furthermore, we found that in response to each 1 °C increase in temperature, there would be an approximate 2.1% increase in the spatiotemporal variation of present-day C4plant biomass in Inner Mongolia, whereas during the geological period, there was a corresponding increase of 10.7%. Comparatively, the spatiotemporal variation in present-day C4biomass on the Chinese Loess Plateau has undergone a 4.0% increase in response to each 1 °C increase in temperature, whereas 6.0% and 7.5% increases in the geological period were estimated based on core samples taken from the Lantian and Xingyang sections, respectively. Interestingly, for each 1 °C increase in temperature during the current growth month of C4plants, there is a 6.6% increase in C4biomass, which is essentially consistent with the results obtained for the geological period results (i.e., 6.0% and 7.5% for the Lantian and Xingyang sections, respectively). The findings of this study reveal a distinct contrast in the variation of C4plants during recent and geological periods, thereby enabling us to quantitatively estimate the potential changes in C4vegetation in response to projected climate conditions.
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影响因子：
64.8
作者：
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通讯作者：
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影响因子：
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