气候变化对青藏高原东缘云杉人工林生长季延长，但水分有效性没有增加，对其生长有促进作用

IF 2.3 3区环境科学与生态学 Q2 ECOLOGY

Web Ecology Pub Date : 2022-07-13 DOI:10.5194/we-22-47-2022

Yu Feng, Songlin Shi, Peihao Peng, Qiang Zhou, Haijun Wang, Xiubin Liu

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引用次数: 1

摘要

摘要在青藏高原东部，树木的生长受到气候变化的强烈影响。先前的研究人员发现，气候变暖改变了热和水力条件，延长了生长季节，促进了树木的生长。一些研究分析了干旱、降水和温度对树木生长的影响。然而，以往的研究主要集中在天然林上，很少有关于人工林对气候变化响应的研究。为此，我们研究了树木年代学(basedarea increment, BAI)、归一化植被指数(normalized difference vegetation index, NDVI)和气候因子之间的关系，探讨了利云杉(Picea likiangensis var. rubescens)人工林对气候变化的响应。结果表明:1990—2018年，研究区气温显著升高;增加的速度是每十年0.39度。气候因子中，自校正Palmer干旱严重指数(scPDSI)对BAI的影响最为显著。从5月到12月，BAI与scPDSI呈显著负相关，其中9个月呈显著负相关。7月、9月、7月和9月的最低2 m温度(TMN)与bai呈显著正相关。10月、12月和7月的最高2 m温度与BAI呈显著正相关。7月、12月和7月的平均2 m温度(TMP)与BAI呈显著正相关。BAI与年NDVI (NDVIa)呈显著正相关，表明NDVI可用于研究人工林对气候变化的响应。我们的研究有助于更好地了解高海拔地区人工林生长对气候变化的反应，这是森林管理者所需要的。

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Lengthening of the growth season, but no increased water availability, and increase in growth of Picea likiangensis var. rubescens plantations on eastern Tibetan Plateau due to climate change

Abstract. On the eastern Tibetan Plateau, the growth of trees is strongly affected by climate change. Previous researchers have found that climate warming changes thermal and hydraulic conditions, lengthening the growing season and promoting tree growth. Some studies have analyzed the effects of drought, precipitation, and temperature on tree growth. However, previous studies have mainly focused on natural forests, with few studies on the response of plantations to climate change. Therefore, we studied the relationship between dendrochronology (basal area increment, BAI), normalized difference vegetation index (NDVI), and climate factors to explore the response of Picea likiangensis var. rubescens plantations to climate change. The results showed that from 1990 to 2018, the temperature in the study area increased significantly; the rate of increase was 0.39∘ per decade. Among the climate factors, self-calibrated Palmer drought severity index (scPDSI) had the most significant impact on BAI. From P_May (P_ represents the month of the previous year) to December, BAI was always negatively correlated with the scPDSI, with 9 months being significantly negatively correlated. BAI was significantly positively correlated with the minimum 2 m temperature (TMN) in P_July, P_September, July, and September. BAI was significantly positively correlated with the maximum 2 m temperature (TMX) in P_October, P_December, and July. BAI was significantly positively correlated with the mean 2 m temperature (TMP) in P_July, P_December, and July. There is a significant positive correlation between BAI and annual NDVI (NDVIa), which means that NDVI can be used to study the response of plantations to climate change. Our study contributes to a better understanding of the response of plantation growth in high-altitude areas to climate change, which is needed by forest managers.

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来源期刊

Web Ecology Agricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics

CiteScore

4.60

自引率

0.00%

发文量

审稿时长

17 weeks

期刊介绍： Web Ecology (WE) is an open-access journal issued by the European Ecological Federation (EEF) representing the ecological societies within Europe and associated members. Its special value is to serve as a publication forum for national ecological societies that do not maintain their own society journal. Web Ecology publishes papers from all fields of ecology without any geographic restriction. It is a forum to communicate results of experimental, theoretical, and descriptive studies of general interest to an international audience. Original contributions, short communications, and reviews on ecological research on all kinds of organisms and ecosystems are welcome as well as papers that express emerging ideas and concepts with a sound scientific background.