民勤荒漠梭梭茎干液流动态
Pratacultural Science（2023）
Abstract
梭梭(Haloxylon ammodendron)耗水过程研究是维持干旱区人工固沙林生存和生长的关键环节,本研究基于热扩散(TDP)监测技术获取民勤生长季梭梭茎干液流实时数据,分析梭梭茎干液流动态,为明晰梭梭生长过程的耗水提供重要佐证.结果表明:梭梭茎干液流流速随林龄生长而增大,也随着梭梭老龄化生长衰退而减弱,10龄、15龄、20龄梭梭茎干日平均液流流速分别为1.059、1.460和0.570 cm3·(cm2·h)?1,5月-10月生长季累计液流量分别为423.386、1041.186和430.212 kg.梭梭茎干液流随梭梭地径增粗而增大,不同茎级梭梭茎干日平均液流流速介于0.276～2.132 cm3·(cm2·h)?1,生长季累计液流量介于121.656～1722.810 kg.不同龄林梭梭液流以大径级梭梭启动时间早,持续时间长,峰值高,液流启动时间07:00-08:00,日均最大液流流速2.767～5.536 cm3·(cm2·h)?1,日最大液流流速出现时间随林龄生长延迟了1.5～4.0 h.不同龄林梭梭液流变化反映了梭梭生长耗水过程及其对干旱环境的响应,而不同径级梭梭液流变化反映了梭梭个体生长差异也存在明显的竞争优势.分析结果可为荒漠梭梭固沙林生态用水估算提供理论支撑.
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