ISWC OpenIR  > 水保所知识产出(1956---)
Thesis Advisor赵允格
Degree Grantor中国科学院研究生院
Place of Conferral北京
Keyword生物结皮 发育阶段 基质土壤 入渗 模拟

1 )生物结皮导致土壤 的 斥水性增加, 但土壤斥水性随生物结皮演替逐渐降低。
藓类盖度达 20%以上时,土壤斥水时间显著低于藻结皮土壤。生物结皮土壤的斥水性
皮层土壤的斥水性则在 20%田间持水量时最大。
2 )生物结皮增加了土壤 的 持水性和水分有效性。生物结皮发育后土壤的持水性
3 )生物结皮影响水分入渗过程,影响幅度受制于基质土壤,生物结皮与基质土
4 )通过修订 Green-Ampt  模型,可用于 模拟生物结皮覆盖在黄绵土上的水分入
渗过程, 除浅藻结皮外,深藻、藻+ 少藓、藓+ 少藻、藓结皮覆盖下的水分入渗过程
的拟合结果与实测值吻合。校正的 Green-Ampt 模型将生物结皮对水分入渗过程的影

Other Abstract

Biological soil crust (biocrusts) extensively developed after the “Grain for Green”
eco-project was implementated in the Loess Plateau region, there is a large area of
biocrusts in the region. So far, we had not clearly known what and how the biocrusts,
which were in different successional stages, had an effect on water infiltration. In the study,
soil hydraulic and infiltration parameters of biocrusts in different successional stages were
measured and analyzed so as to determiner effect of biocrusts in different successional
stages on water infiltration. Then the process of water infiltration was simulated. The study
was aimed at clarifying and definiting the role of biocrust played on water infiltration
process. The study may benifit effective management of biocrusts, rational utilization of
water and soil resources to promote vegetation restoration, promote the healthy
development of the ecosystem. The results were as follows.
(1) The formation of biocrusts lead to an increase of soil water repellence (SWR)
markedly. The SWR showed a decrease trend along with the succession of biocrusts.
Soil moisture content and the composition of biocrusts were the major influence
factors of SWR.
No SWR was observed on the loessal soil without bioctrust in Hilly and Gully Region
of the Loess Plateau. However, a slight SWR was developed on soil when biocrusts
presented, both in the intensity and persistence. SWR of biocrusts showed a decrease trend
along with the succession of biocrusts. SWR of biocrusts with the moss coverage above
20% was significantly lower than that of cyanobacterial crusts. SWR of biocrusts was
related to soil moisture and dominant species. SWR increased against the decrease of soil
water content for moss dominated biocrusts, while there was a bimodal curve as the
decrease of soil water content for the cyanobacterial biocrusts. For the light cyanobacterial
crust, SWR approached the maximum value at 40% of field water holding capacity. While  for the other four stages of biocrusts, which were dark cyanobacterial crust,
cyanobacterial and little moss crust, moss and little cyanobacterial crust as well as the
moss dominated crust, SWR reached the maximum value at 20% of field water holding
(2) Soil water retention and moisture availability were increased with the
presentation of biocrusts. Soil water retention increased after the formation of biocrust,
along with the soil moisture availability. But the soil water retention and soil moisture
availability decreased during the development of biocrusts.
(3) Biocrusts showed an effect on the process of water infiltration, the range of
effection was subject to the matrix soil. Meanwhile, the interaction between biocrusts
and matrix soil effected the the process of water infiltration. Water infiltration rate was
reduced with biocrusts, the descent range relaxed as the succession of biocrust. The
influence of biocrust on water infiltration process varied with the change of matrix soil.
(4) Water infiltration process of Loessal soil covered with biocrusts can be
simulated by the revised Green - Ampt model. The model fitting infiltration rate of
soil covered with biocrusts were consistent with the measured values except for soil
covered with light cyanobacterial crust. For the revised Green-Ampt model, biocrusts
had an efffect on water infiltration process, boiled down to the influence of soil hydraulic
conductivity, and the water infiltration process is controlled by layer of biocrusts. The
energy dynamics theory of water infiltration process of biocrust covered on Aeolian sandy
soil and Lou soil were more complex than that on Loessal soil, so further research was
Key words: biological soil crusts, successional stage, matrix soil, infiltration, simulation

Document Type学位论文
Recommended Citation
GB/T 7714
张培培. 黄土丘陵区生物结皮对水分入渗的影响及模拟[D]. 北京. 中国科学院研究生院,2014.
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