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Northwest A&F University (2017)

Experimental Study on the Rainwater Collection and Infiltration (RWCI) System in Loess Plateau of China

宋小林;

Titre : Experimental Study on the Rainwater Collection and Infiltration (RWCI) System in Loess Plateau of China

Auteur : 宋小林;

Grade : Doctoral Dissertation 2017

Université : Northwest A&F University

Résumé partiel
China is the largest apple producer in the world,supplying approximately 40% of the global harvest.The Loess Plateau in the northwest China is one of the two largest apple growing regions in China.Water is a key factor for the sustainable development of rain-fed apple orchards on the Loess Plateau,and is also important for stable yields and the production of high quality fruit.Water scarcity is a critical problem for rain-fed agricultural production in the Loess Plateau,and this has greatly affected yield and quality of apples.Rainwater is the most valuable water resource in this area with a high potential for improved utilization.The exploitation and utilization of rainwater resources is an effective measure for alleviating water scarcity.The Rain Collection and Infiltration Systems(RWCI)is a new method suitable for rain-fed orchards in the Loess Plateau of China,and it has the advantage of saving water,preserving soil moisture,reducing drought stress and storing rainfall runoff.RWCI system is a composite technology including rainwater collection technology,drainage technology,anti-seep technology and water and fertilizer conservation.Six RWCI treatments(with 4replicates)were used in mature apple orchard with 3 design depth(pit depth of 40 cm,60 cm and 80 cm)and 2 watertight design(impervious barrier and non-impervious barrier),and fish-scale pit(CK)and Bare slope(BS)as the controlled trial.Under natural conditions(without irrigation all year round),this study was conducted to investigate the distribution characteristics of soil moisture and roots and the effect of RWCI system on fine roots and apple production.The main research and findings are as follows :(1)There was a low soil moisture zone appeared in the 60-80 cm soil profile under Fish-scale pit treatment(CK).In CK,the variability of soil moisture occurs mainly in the 0-80 cm soil layers and the soil moisture content declined linearly with the increment of the depth of soil layer.On the whole(0-300 cm soil layers),the mean soil moisture content under CK was significantly higher than that in BS.And the increment of the mean soil moisture content under CK was 13.69 % in the dry year(2015)relative to BS,and in the wet year it was0.98%.(2)RWCI system could significantly increase the soil moisture content in the rhizosphere soil of apple tree.All RWCI system(RWCI40,RWCI60 and RWCI80)clearly influence the soil moisture in the 20-100 cm soil layer,and in RWCI system,the increment of annual soil moisture content to CK in 2015(dry year)was obviously higher than that in 2016(wet year).In the 20-100 cm soil layers,the increment of annual soil moisture content in RWCI system(RWCI40,RWCI60 and RWCI80)with impervious barrier were 33.15%,37.40%and 37.40%,respectively,in 2015(dry year)and 45.22%,51.17% and 51.17%,respectively,in 2016(wet year).In the 20-100 cm soil layers,the increment of annual soil moisture content in RWCI system(RWCI40,RWCI60 and RWCI80)with non-impervious barrier were 33.21%,45.99% and 31.50%,respectively,in 2015(dry year)and 47.22%,55.69% and 44.64%,respectively,in 2016(wet year).It can be seen from the comparison of the difference of soil moisture between impervious and non-impervious barrier RWCI system that the shallower depth of RWCI system designed was,the greater the insignificant difference of soil moisture between impervious and non-impervious barrier RWCI system.The result showed clearly that it was not necessary to lay impervious barrier in the pit of RWCI system.

Mots clés : Loess Plateau; Apple orchard; Soil moisture; Root system; Rainwater collection and infiltration system(RWCI);

Présentation (CNKI)

Page publiée le 16 janvier 2018