Differences and mechanisms on water use of Pinus sylvestris var mongolica forests with different origins

doi:10.13287/j.1001-9332.202310.027

Abstract

Abstract: Determining the differences of water use characteristics of a tree species with different origins (natural forests and introduced plantations) is significantly important for forest sustainable management. Pinus sylvestris var. mongolica is an important tree species of afforestation in the ‘Three North’ project in China. In this study, with Pinus sylvestris var. mongolica from two origins, we monitored the sap flow velocity of sapwood (J_s) of trees by thermal dissipation sap flow probes, and analyzed the relationship between water transportation and the environmental factors during the growing season. The results showed that under the typical sunny day, daily sap flow velocity (J_s-daily) of trees from plantations was significantly higher than that from natural forests. The mean value of J_s-daily was 132.98 and 114.86 cm·d^-1 for the two origins, respectively. Trees from plantations showed higher water transportation potential than natural forests. Vapor pressure deficit (VPD) mainly showed the driving effect on the water use process of trees from natural forests. In the plantations, there was an obvious threshold effect, and the inflection point of VPD was about 1.91 kPa, with the boundary function of J_s-hour increased to the maximum of 17.88 cm·h^-1. Atmospheric driven transpiration potential (J_s-hour/VPD) of P. sylvestris var. mongolica trees with two origins decreased with the aggravation of soil drought, but sensitivity to drought was higher in the plantations than in the natural forests, suggesting the strong ability of Pinus sylvestris var. mongolica to regulate water use process.

Key words: Pinus sylvestris var mongolica natural forest, P sylvestris var mongolica plantation, water use cha-racteristic, sap flow, water transportation potential

LIU Chunying, DANG Hongzhong, CHEN Shuai, LI Mingyang, GE Jinnan, QIAO Yina, LIU Yuguo. Differences and mechanisms on water use of Pinus sylvestris var mongolica forests with different origins[J]. Chinese Journal of Applied Ecology, 2023, 34(10): 2619-2628.

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