黄土区土壤干层形成机理与调控研究进展(3)

　　（4） 建立具有物理意义的土壤干层预测模型，阐明不同情景下的土壤干层调控机制，提出土壤干层科学调控的可能途径。目前已有生态水文模型大都只考虑了较浅土层的土壤水分过程，对深层土壤水分考虑较少。此外，已有模型未考虑植被深根系分布特征、中低水势土壤水分过程及生长年限影响，极大地限制了这些模型在土壤干层模拟预报方面的应用。因此，基于干层模拟较好的SWCCV模型，通过耦合根系、年限和干层动力学指标的子过程模型，提高不同尺度下水分过程模型的预测精度与敏感性，将有助于进一步揭示土壤干层的发生发展过程与演变机制，进而提出土壤干层有效调控的可能途径，为黄土高原植被有效建造和生态服务功能提升提供科学依据。
　　
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