兴安落叶松根系非结构性碳水化合物对气候变暖的响应及种源差异

doi:10.13287/j.1001-9332.202608.043

摘要/Abstract

摘要： 本文通过同质园移植试验模拟气候变暖,研究了11个兴安落叶松种源的细根、中根和粗根在生长季末期的非结构性碳水化合物(NSC)、可溶性糖(SS)、淀粉(ST)浓度及可溶性糖/淀粉(SS/ST)对气候变暖的响应。结果表明:在气候变暖处理下,兴安落叶松各径级根系的NSC、SS浓度和SS/ST分别显著降低8.0%～10.6%、16.4%～24.5%和25.3%～30.8%;细根和中根的ST浓度显著升高9.9%～15.3%,而粗根ST浓度变化不显著。随着根系径级增大,SS浓度的降幅呈递增趋势,ST浓度的增幅呈递减趋势。各径级根系NSC、SS浓度以及SS/ST在气候变暖后的变化幅度(即变暖效应)与种源种子采集地的干旱指数(AI)均呈显著正相关,ST的变暖效应与AI呈显著负相关。综上,兴安落叶松可通过调节不同径级根系NSC浓度及其组分间比例来响应气候变暖,且响应程度存在种源差异。在探讨树木根系NSC对气候变暖的响应时,应考虑根系径级与种源的影响。

关键词: 气候变化, 碳储存, 同质园, 驯化, 适应

Abstract: We employed a common garden experiment to simulate climate warming, based on which we investigated the responses of non-structural carbohydrates (NSC), soluble sugars (SS), starch (ST) concentrations and the SS/ST in fine, medium, and coarse roots of 11 provenances of Larix gmelinii at the end of the growing season. The results showed that climate warming significantly decreased NSC concentration, SS concentration and SS/ST by 8.0%-10.6%, 16.4%-24.5% and 25.3%-30.8%, respectively, across all root types. ST concentration in the fine and middle roots significantly increased by 9.9%-15.3%, and ST concentration in the coarse roots varied insignificantly. As root diameter increased, the decrease in SS concentration showed an increasing trend, while the increase in ST concentration showed a decreasing trend. The warming-induced changes in NSC concentration, SS concentration, and SS/ST across different root diameter classes after climate warming, namely the warming effect, were significantly and positively correlated with aridity index (AI) of the seed collection sites. In contrast, the warming effect on ST was significantly and negatively correlated with AI. L. gmelinii adapted to climate warming by regulating NSC concentration and the proportions of its components in roots of different diameter classes, and this capacity varied among provenances. The effects of root diameter class and provenance should be considered when investigating the responses of root NSC to climate warming.

Key words: climate change, carbon storage, common garden, acclimation, adaptation

朱文聪, 赵秋兰, 刘亚龙, 全先奎. 兴安落叶松根系非结构性碳水化合物对气候变暖的响应及种源差异[J]. 应用生态学报, 2026, 37(8): 2547-2555.

ZHU Wencong, ZHAO Qiulan, LIU Yalong, QUAN Xiankui. Response of non-structural carbohydrates in the roots of Larix gmelinii to climate warming and provenance variation[J]. Chinese Journal of Applied Ecology, 2026, 37(8): 2547-2555.

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