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Chinese Academy of Agricultural Science (2021)

Effects of Long-term Applications of Organic Materials on Soil Structural Characteristics and Organic Carbon in Dryland of the Loess Plateau

AHMED ALI ABDELRHMAN ALI

Titre : Effects of Long-term Applications of Organic Materials on Soil Structural Characteristics and Organic Carbon in Dryland of the Loess Plateau

Auteur : AHMED ALI ABDELRHMAN ALI

Grade : Doctoral Dissertation 2021

Université : Chinese Academy of Agricultural Science

Résumé partiel
The Loess Plateau is located from 100°54’to 114°33’E and 33°43’to 41°16’N and accounted for one-third of the arable land of China,which plays a vital role in agricultural production.In last decades,the serious soil degradation and water losses was caused by unreasonable agricultural managements especially under semi-arid temperate continental climate like Loess Plateau.Therefore,it is urgent to explore appropriate measurements to maintain ecologically sustainable development on these Loess Plateau.The organic materials such as maize straw and organic manure are extensively applied weather individually or combined together to improve the soil structure and soil organic carbon(SOC).However,the knowledge about comparison effect and it is mechanisms of long-term application of these organic materials on the physical properties and SOC of arid and semi-arid soils are still unclear and lack.The overall objective of this thesis was to evaluate long-term impacts of organic material that was applied for 26 years ago on soil physical properties and SOC content.For this purpose,field experiment was conducted at Dryland Agriculture Demonstration Zone in Zongai Village,Shouyang County,Shanxi Province,China.Two types of organic materials(maize straw and organic manure)were applied individually or combined with balanced mineral N and P fertilizers which included(1)unfertilized control(CK),(2)maize straw at 3000 kg ha-1(S),(3)cattle manure at a low rate of 1500 kg ha-1(LM),(4)maize straw residue at the rate of 3000 kg ha-1,cattle manure at the medium rate of 4500 kg ha-1(S-MM)and(5)maize straw residue at the rate of 3000 kg ha-1,cattle manure at the high rate of 6000 kg ha-1(S-HM).To each treatment,a constant dose of nitrogen(N)and phosphorus(P)(ratio N:P2O5=1:1)at the rate of105 kg ha-1was added to compensate the depletion as a result of intensive cultivation and also to make a balanced fertilization in the macro nutrients of the plants under study.These treatments were arranged in randomized design with two replicates with a plot area is 36 m2(6 x 6 m2).Soil layers were measured during the maize growth stages in 2018.Soil pore structure was measured by X-ray Microtomography in the soil column scale.SOC characteristics were evaluated using Fourier transform infrared spectrometry(FTIR).The coal-C content of soil samples was analyzed using a Chemi-thermal method.The regression analysis was used to assess the relationship between the soil physical properties,SOC,and TOC as well as their respective contributions to the improvement of these soil properties.

Mots clés : Soil organic carbon ;Soil aggregate stability ;Saturated hydraulic conductivity ;Infiltration rate ;Soil pore structure ;

Présentation (CNKI)

Page publiée le 16 novembre 2021