Subjects: Geosciences >> Other Disciplines of Geosciences submitted time 2022-09-26 Cooperative journals: 《干旱区研究》
Abstract： Revealing the relationship characteristics between the intensity of ecosystem service (ES) tradeoffs and the matching degree of ES supply and demand can provide possible ways to alleviate the ES conflict and supply- demand contradiction simultaneously. The districts and counties of Shanxi Province are selected in this study. Considering the tradeoff between supply and support service, tradeoff type 1 is when the supply service is relatively enhanced but support service is decreased, whereas tradeoff type 2 is the opposite condition. The influencing factors of ES tradeoffs and supply-demand and their related characteristics are revealed by redundancy analysis and piecewise linear regression. The following results are presented. (1) The high- value regions of tradeoff type 1 and the low-value regions of supply-demand ratio are mainly located in the basins, and the highvalue regions of tradeoff type 2 and supply-demand ratio are mainly located in the mountainous area. (2) Tradeoff type 1 is mainly affected by cropland, forestland, grassland, air temperature, and other factors. Meanwhile, tradeoff type 2 is primarily influenced by cropland, forestland, NDVI, and soil organic matter, but the direction of effects is opposite to that of tradeoff type 1. (3) The forestland, grassland, and slope gradient have significant positive effects on the supply-demand ratio of type 1, while the cropland and construction land have significant negative effects. The factors have minimal effects on the supply-demand ratio of type 2. (4) The effects of factor direction on tradeoff type 1 and the supply-demand ratio are opposite, which mainly contributes to the negative correlation between them. The response of the ES supply-demand ratio to tradeoffs is relatively strong when the contradiction between ES supply and demand is small. However, this response weakens with the deepening of the supply-demand contradiction. The relationship characteristics indicate the ecological dilemma: the human demand increases-development intensity increases-tradeoff type 1 enhances-the contradiction between supply and demand intensifies. A weak positive correlation is observed between tradeoff type 2 and supply-demand ratio, indicating the situation of ecological surplus. Overall, a correlation is observed between ES tradeoff and supply- demand. The results generally present the correlation characteristics and its formation mechanism, which can provide a scientific basis for land ecological restoration and management.
Subjects: Geosciences >> Other Disciplines of Geosciences submitted time 2019-09-10 Cooperative journals: 《干旱区研究》
Abstract：以青藏高原腹地典型高寒草甸植被类型为研究对象，采用红外灯加热的方法模拟全球增温，并利用水分探头，于2012年植物生长季（5—9月）获取0~100 cm不同土层深度土壤水分含量数据，并分析其对增温的响应。结果表明：① 短期增温对高寒草甸土壤水分含量有提高作用，但增幅并不显著（P>0.05），平均提高2.85%。② 土壤水分含量随土层深度的增加呈现先减少后增加的趋势，在10~20 cm土层深度处降为最低值13.8%，在60~100 cm土层深度附近达到了20.57%的最高值；对照组5个月10~20 cm土层深度的土壤水分含量显著低于其他土层，而增温组0~20 cm土层深度的土壤含水量显著低于其他土层深度，表明增温对表层（0~10 cm）的土壤含水量影响较大，对深层土壤含水量的影响则较小，而且短期增温不会对土壤水分的垂直分布趋势产生影响。③ 土壤水分含量随时间的变化，在5—8月呈上升趋势，表明在青藏高原北麓河地区植物生长季，8月是其土壤水分含量最充足的月份，到了9月土壤中含水量开始降低，但5个土层深度降幅均不明显；增温组土壤水分含量随时间的变化趋势与对照组基本一致。
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