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Nanhua University (2019)

Effects of Microalgae-biochar on Sand Fixation and Improvement of Desert Soil

陈萌萌;

Titre : Effects of Microalgae-biochar on Sand Fixation and Improvement of Desert Soil

Auteur : 陈萌萌;

Grade : Master’s Theses 2019

Université : Nanhua University

Résumé partiel
Desertification is not only the ecological environment problems,but also the important economic and social problems.Worldwide,many countries are disturbed by desertification problem,More than 100 countries are influenced,and about 1 billion people are directly threatened by desertification.In global,desertification areas reach 36 million km2.In response to the problem,many techniques and methods have been put forward in the world.Engineering,chemical and biological methods are transformed into combined methods.Request changed from fixeing desert to improving desert ecological environment.This paper is based on :(1)Desert microalgae crust can fix sand soil in some degree,biochar is used as fertilizer and water retaining material.Firstly,we should restore and expand Microcolus vaginatus.Secondly,based on physicochemical property analysis,we choose 400℃,6 h chaff biochar and400℃,6 h sawdust biochar as our experimental material.This study set up14 experiment treatments,2 duplicate samples.With 400g desert sand as the basis,14 treatments were respectively blank sample,only applied into the chaff biochar 3 samples(mass ratio of 2%,4%,8%),only applied into the sawdust biochar 3 samples(mass ratio of 2%,4%,8%),only applied into the sample content of chlorophyll-a was 20 mg/L,3 treatments of microalgae combined with chaff biochar(mass ratio 2%,4%,8%)and 3 treatments of microalgae combined with sawdust biochar(mass ratio 2%,4%,8%).Then,we through that sand table simulation of microalgae combined biochar mixed in desert soil in laboratory culture with 90 d.At the end of culture,it is tested and analyzed that soil particle diameter range,water retention rate,effective P content,total N content,organic C content and pH of desert soil :(1)Biochar can effectively improve desert soil fertility.In 6 treatments treated with biochar alone,the content of effective P,total N and organic C in desert soil increased with the increase of biochar application.The best of which is applied into the 8%chaff biochar,soil effective P content was 4.6times higher than that of blank treatment,total N content was 2.1 times higher than that of blank treatment,and organic C content was 2.4 times higher.

Mots clés : biochar; microalgae; sand fixation; water holding capacity; desert soil improvement

Présentation (CNKI)

Page publiée le 30 avril 2020