红河干热河谷主要芒果(Mangifera indica L.)品种对海拔的生理生态响应

	红河干热河谷主要芒果(Mangifera indica L.)品种对海拔的生理生态响应; Eco-Physiological Responses of Major Mango (Mangifera Indica L.) Cultivars to Altitude in Honghe Dry Hot Valley
	TEWODROS TESFAYE WUBSHET
导师	许建初
摘要	Shifting commercial mango cultivation upslope is suggested to be a promising adaptative strategy in the face of warming due to climate change. Previous studies related to the effects of climate change on mangoes have concentrated on mature plantations and largely overlooked young mango trees. Hence, it is necessary to examine the eco-physiological performance of young mango trees across altitudinal gradients to ensure later crop success. Accordingly, this study focused on eco-physiological responses, including the vegetative growth, leaf nutrient content, gas exchange and sap flux of young mango trees of four major local commercial cultivars. These are Tainong No.1, Jingdong, Jinhuang and Guifei. A total of 192 two-year-old seedlings were established on three replicate plots prepared at 450 m and 1050 m, with a planting density of 5m x 3m. Trees were fertilized and irrigated uniformly in accordance with local mango farming practices. Past modelling efforts into shifting suitability areas across elevation gradients have focused on other economic tree crops, while neglecting the mango tree. This is a critical gap, given its importance to Yunnan Province’s agricultural economy. Thus, this study further investigated the suitability area changes and altitudinal shifts in mango under climate change by 2050 and 2070 under RCP4.5, and RCP8.5 CO2 emission scenarios respectively using maximum entropy (MaxEnt) modeling. The result of the eco-physiological studies showed that the vegetative growth of four of the cultivars grown at 1050 m was significantly lower compared to those grown at 450 m. However, no significant difference in growth between cultivars was observed. Leaf nutrient analysis of all cultivars showed significantly higher N and K at 1050 m compared to 450 m. Furthermore, photosynthetic capacities, including maximum carboxylation rate (Vmax), photosynthetic electron transport rate (Jmax), and apparent quantum yield (AQY) in cultivar Tainong No.1 were significantly higher at 1050 m compared to Jinhuang. However, Jinhuang showed significantly higher photosynthetic capacities at 450 m compared to Tainong No.1. Seasonal photosynthesis at light-saturated (PNsat) Tainong No.1 was significantly higher at 1050 m compared to cultivar Jinhuang during hot-dry and warm-wet seasons, while the opposite was true for Jinhuang. Stomatal conductance (gs) during the warm-wet season of cultivar Jinhuang showed higher gs at 450 m, while Tainong showed higher gs at 1050 m. In addition Tainong No.1 showed significantly higher gs compared to Jinhuang at 450 m during the hot-dry season. Furthermore, cultivar Tainong No.1 showed significantly higher transpiration rates (E) compared to cultivar Jinhuang at 1050 m during hot-dry and warm-wet seasons, and the opposite was true at 450 m. Seasonal intrinsic water use efficiency (WUEi) of cultivar Tainong No.1 was significantly higher compared to Jinhuang at 1050 m during the cooler-dry season. Moreover, Tainong No.1 showed
	2021-12
文献类型	学位论文
条目标识符	http://ir.kib.ac.cn/handle/151853/74540
专题	昆明植物所硕博研究生毕业学位论文
推荐引用方式 GB/T 7714	TEWODROS TESFAYE WUBSHET. 红河干热河谷主要芒果(Mangifera indica L.)品种对海拔的生理生态响应, Eco-Physiological Responses of Major Mango (Mangifera Indica L.) Cultivars to Altitude in Honghe Dry Hot Valley[D],2021.

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