The Evapotranspiration of Tamarix and Its Response to Environmental Factors in Coastal Saline Land of China
The Evapotranspiration of Tamarix and Its Response to Environmental Factors in Coastal Saline Land of China
复制标题
我国滨海盐碱地柽柳蒸散量及其对环境因子的响应
DOI：
10.3390/w11112273
复制
发表时间：
2019-11-01
期刊：
影响因子：
3.4
通讯作者：
Wang, Jianlin
中科院分区：
文献类型：
--
作者：
Chen, Huanyu;Yang, Ce;Wang, Jianlin
(1)背景：柽柳(Tamarix chinensis)作为盐生植物，可用于我国盐渍土修复。盐渍土的开垦和恢复取决于植物的耗水量。然而，盐渍土中的水资源能否支撑柽柳植被的建设仍是未知数。 (2) 方法：在本研究中，我们利用树液流测量了柽柳3年的蒸腾量(T)，并使用微型蒸渗仪测量了柽柳土地1年的蒸发量(E)。利用2018年获得的土壤作物系数估算2016年和2017年的蒸发量。 (3)结果：蒸散量(ET)范围为514.2~573.8 mm，受风速、VPD和地下水位影响较大。蒸腾是该地区耗水的主要形式，占总蒸散量的60.2%。与裸地相比，2018年植被建设增加了土壤水分消散量377.6毫米。根据现场测量和估算，旱年缺水量为107.2毫米，平年和丰水年剩余水值分别为77.8毫米和187.5毫米。 5月和9月是不同降水年份普遍缺水的月份。尽管该植物的种植增加了耗水量，但研究年内地下水位仍保持在约 0.5 m。 (4)结论：这些结果表明，在沿海盐渍土中种植柽柳对于盐渍土的开垦和恢复是可行的。在枯水年（2017年），蒸散量的消耗超过了降水量。平年（2016年）和丰水年（2018年）则相反。综上所述，我们的研究结果表明，中国沿海盐渍土的水资源能够承受植被建设，为盐渍土的恢复奠定了坚实的基础。
(1) Background: As a halophytic species, Tamarix (Tamarix chinensis) can be used for saline soil rehabilitation in China. The reclamation and rehabilitation of saline soil depend on the water consumption of plants. However, whether water resources in saline soil can support the construction of Tamarix vegetation is still unknown. (2) Methods: In this study, we measured the transpiration (T) of Tamarix for 3 years using sap flow and the evaporation (E) for 1 year using a micro-lysimeter in Tamarix land. The evaporation values in 2016 and 2017 were estimated with the soil crop coefficients obtained in 2018. (3) Results: The evapotranspiration (ET) ranged from 514.2 to 573.8 mm and was greatly affected by the wind speed, VPD and groundwater table. Transpiration was the main form of water consumption in this region, accounting for 60.2% of the total evapotranspiration. Compared with bare land, vegetation construction increased soil moisture dissipation by 377.6 mm in 2018. According to on-site measurements and estimates, the water shortage in the dry year was 107.2 mm, and the residual water values in the normal year and wet year were 77.8 mm and 187.5 mm, respectively. May and September were months of widespread water shortages in different precipitation years. Although the cultivation of this plant increased water consumption, the groundwater table remained at approximately 0.5 m during the study year. (4) Conclusions: These results indicated that planting Tamarix in coastal saline soil was feasible for the reclamation and rehabilitation of saline soil. In the dry year (2017), the consumption of evapotranspiration exceeded the precipitation. The inverse occurred in the normal year (2016) and wet year (2018). Taken together, our findings showed that the water resources in the coastal saline soil of China could tolerate vegetation construction and laid a strong foundation for saline soil rehabilitation.