旱化成龄柠条平茬后的补偿生长通常会加剧土壤旱化。从水源拓展的角度，进一步提高小降水事件的转化利用是改善柠条补偿生长并维持土壤水分环境相对稳定的一条潜在途径，但是深根性灌木对小降水的利用存在响应机制复杂、相对富集能力不足等问题。据此，本项目以荒漠草原旱化成龄人工柠条为对象，从小降水事件和枝、细根等功能构件入手，采用田间控制与室内模拟实验相结合的方法，分别开展补偿生长与土壤水分环境动态及其关系格局、小降水事件在灌丛-土壤系统的转化利用与功能构件动态等方面的控制模拟实验研究，分析枝系构型与灌丛茎流集水、土壤水分有效性与细根分布动态间的相互关系，阐明柠条对小降水事件的相对利用程度及其制约因素和作用机制，综合分析基于小降水事件的补偿生长与土壤水分环境平衡关系的功能构件调节机制与途径，探究有效改善旱化成龄柠条补偿生长并维持土壤水分环境相对稳定的理论依据。

The soil generally become more drought for the compemsative growth of mature peashrub after stump, therefore, the risk for productivity management will be increased. To futher increase the transforming and using effectivity of little precipitation events, it may be potential and effective pathway to improve compensative growth and remain soil water environment stable. However, there are some defects for the utilization of little precipitation events for deep-root shrubs, including the complexity of response mechanism and shortcomes in rainfall harvesting. In the program, we will study the dynamics of compensative growth and soil water environment and their relationship, the transformation and utilization of little precipitation events in the shrub-soil system and the dynamics of functional modulars, and so on, based on the little precipitation events and functional modulars(branch and fine root), for the drought and mature peashrub in desert steppe, through field control tests and indoor simulate ones. The relationship between branch architecture and stemflow, and that between soil water availabilities and fine roots distribution and dynamics will be analysed, to enucleate the utilization of little precipitation events and restricting factors and mechanism. At the end, the balancing mechanism and regulation pathway through functional modulars between compensative growth and soil water environment will be analysed based on little precipitation events. The theory to improve compensative growth and remain the stability of soil water environment at the same time will be explored.