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首页> 外文期刊>Journal of forest research >Estimating water use of a black locust plantation by the thermal dissipation probe method in the semiarid region of Loess Plateau, China.
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Estimating water use of a black locust plantation by the thermal dissipation probe method in the semiarid region of Loess Plateau, China.

机译：黄土高原半干旱地区用热探针法估算刺槐人工林用水量。

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Black locust (Robinia pseudoacacia) is a major reforestation species in the semiarid region in the Loess Plateau of China. There has been increasing concern about the sustainability of the plantations because of their possible high water-use. This study was, accordingly, undertaken to quantify the stand-scale water use of a middle-aged black locust plantation in the region. The thermal dissipation probe method was applied to 27 trees to measure sap flux densities in an experimental plot during the growing season of 2008. The monoculture stand has a basal area of 23.3 m2 ha-1 and a maximum plant area index (PAI) of 2.89. Sapwood areas were estimated by use of a regressive relationship with the diameter at breast height (DBH) for scaling up of stand transpiration. The results showed that DBH could be a good predictor of sapwood area of individual trees. The diurnal cycles of average sap flux densities differed among DBH classes. Daily transpiration can be predicted from mean daily daytime vapor pressure deficit (VPDm) using a fitted exponential saturation model. Model variables were different among seasons, probably owing to different soil water conditions and leaf phenology. By using the derived model for each month, stand canopy transpiration over the growing season was estimated to be 73.8 mm, with an average daily value of 0.41 mm day-1 and a maximum of 0.89 mm day-1. The relatively small estimates of stand transpiration might be attributed to low PAI and sap wood area of the middle-aged stand.
机译：刺槐（Robinia pseudoacacia ）是中国黄土高原半干旱地区的主要造林物种。由于人工林的高耗水量，人们对其可持续性的关注日益增加。因此，进行了这项研究以量化该地区中年黑刺槐人工林的林分规模用水。在2008年的生长季节中，采用热探针法对27棵树进行了试验性地测量树液通量密度。单一栽培林的基础面积为23.3 m 2 ha -1 ，最大植物面积指数（PAI）为2.89。通过使用与胸高直径（DBH）的回归关系来扩大边际蒸腾量来估算边材面积。结果表明，DBH可以很好地预测单个树木的边材面积。 DBH类之间的平均树液通量密度的日循环不同。可以使用拟合的指数饱和模型根据日平均蒸气压亏缺（VPD m ）预测日蒸腾量。不同季节之间的模型变量是不同的，这可能是由于土壤水分条件和叶片物候不同所致。通过使用导出的模型，每个月的生长期冠层蒸腾量估计为73.8 mm，日平均值为0.41 mm day -1 ，最大值为0.89 mm day -1 。林分蒸腾的相对较小的估计值可能归因于中年林分的较低的PAI和林木面积。

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