为了解全球变暖及其导致的高温干旱气候对地被竹生长产生的影响,通过模拟自然高温干旱条件,以髯毛箬竹为研究对象,分析其叶片气体交换、细根和叶片水势、抗氧化酶等生理生态反应过程与高温干旱的关系.结果表明:(1)不同高温干旱条件对髯毛箬竹的影响不同,对照组中常温条件下植株的光合速率为(7.141±0.072)μmol/(m2·s),高温可明显提升蒸腾速率和气孔导度,极端高温条件下表现为非气孔限制因素导致光合速率[(4.898±0.395)μmol/(m2·s)下降],并且收窄光合日进程的变幅;(2)中度干旱、高温+中度干旱、极端高温+中度干旱的条件下,光合速率的降低是由气孔限制因素导致;(3)重度干旱、高温+重度干旱、极端高温+重度干旱的环境将严重影响植株生理进程,高温加剧这一进程,具体表现为蒸腾速率、光合速率、气孔导度和水分利用效率显著下降;(4)对照组、高温组和极端高温组的细根水势谷值下降范围分别为(-0.111±0.033)~(-0.961±0.086)、(-0.173±0.060)~(-0.970±0.072)和(-0.304±0.061)~(-1.225±0.166)MPa,降幅比成熟叶片强烈;(5)高温和干旱对细根、成熟叶片3种抗氧化酶活性的影响一致,细根SOD活性大于成熟叶片,而CAT和POD活性则相反,因此,细根是髯毛箬竹适应高温干旱环境的重要器官,水分吸收器官比蒸腾器官敏感.研究显示,髯毛箬竹具有较好的抗高温和抗旱能力,一定范围内的高温和干旱能提升其叶片、细根的生理生态适应能力,特别是复合条件下,高温与干旱对其生长表现出协同作用,极端高温+中度干旱并不威胁其生存,高温、中度干旱及高温+中度干旱有利于驯化栽培,甚至在一定程度上能促进其生长;重度干旱则使植株叶片气体交换、叶片和细根的水分生理进程受损,不适宜长期重度干旱的环境,高温使这种损伤更加严重. In order to understand the effects of global warming and the high and arid climate on the growth of bamboo, the effects of natural high temperature and drought on the growth of bamboo were studied in this paper. The effects of gas exchange, fine root and leaf water potential, (7.141 ± 0.072) μmol / L. The results showed that: (1) The effects of different high temperature and drought conditions on Trichosanthes fulva were different, the photosynthetic rate of the plants under normal temperature was (7.141 ± 0.072) μmol / (m2 · s). The transpiration rate and stomatal conductance were significantly increased under high temperature, and the non-stomatal limitation under high temperature resulted in the decrease of photosynthetic rate [(4.898 ± 0.395) μmol / (m2 · s)], (2) Under the condition of moderate drought, high temperature + moderate drought, extreme high temperature + moderate drought, the decrease of photosynthetic rate is caused by the limitation of stomata; (3) Severe drought, high temperature + severe drought , Extreme high temperature + severe drought environment will seriously affect plant physiological processes, high temperature exacerbated the process, manifested as transpiration rate, photosynthetic rate, stomatal conductance and water use efficiency decreased significantly; (4) control group, high temperature group and pole The descending range of fine root water potential valleys in high temperature group were (-0.111 ± 0.033) -0.961 ± 0.086, (-0.1770 ± 0.060) -0.970 ± 0.072 and (-0.304 ± 0.061) -1.225 ± 0.166) MPa. (5) The effect of high temperature and drought on the activities of three antioxidant enzymes in fine roots and mature leaves was the same. The activities of SOD in fine roots were higher than those in mature leaves, but the activities of CAT and POD were opposite. , The fine root is a major organ of Trichosanthes pubescens adapted to high temperature and drought environment, and its organ of moisture absorption is more sensitive than that of transpiration organ.Studies show that Tricholoma matsutake has better ability of resisting high temperature and drought and increasing temperature and drought within a certain range Its leaf and fine root have physiological and ecological adaptability. Especially under combined conditions, high temperature and drought show synergistic effect on its growth. Extreme high temperature + moderate drought does not threaten its survival, high temperature, moderate drought and high temperature + moderate Drought is conducive to domestication and cultivation, even to a certain extent, it can promote its growth; Severe droughts make plant leaf gas exchange, leaf and fine root water physiological process damage, not suitable for long-term severe drought environment, the damage caused by high temperature more serious.