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不同处理方式的作物秸秆田间腐解特性研究
曹莹菲1,2; 张 红1,2; 刘 克1; 吕家珑1,2
2016
Source Publication农 业 机 械 学 报
Volume47Issue:9Pages:213-219
Abstract

采用尼龙网袋法,结合热重分析,研究玉米和大豆秸秆在 3 种试验地(葡萄园、桃园、农田)腐解过程中的腐
解率和组分变化,为秸秆还田措施提供理论依据。结果表明,腐解前期 0 ~20 d 作物秸秆腐解 20% 以上,20 ~120 d
腐解率无明显变化,120 d 后继续腐解至 60% ~70%,大豆秸秆前期较玉米秸秆腐解快。热重分析得出,玉米秸秆
在腐解期间(20 ~45 d)会产生 TG 曲线上200 ~300℃阶段的失重(20% ~30%),腐解后期,大豆秸秆在300 ~400℃
的失重百分比高于玉米秸秆,TG-DTG 曲线在600 ~700℃阶段的失重量到腐解末期(300 d)均为6%左右,随着腐解
的进行,固定碳和灰分百分比上升至 40%。作物秸秆的腐解率、组分百分比在不同处理间(新鲜与干燥处理、大豆
秸秆与玉米秸秆处理、加氮与未加氮处理)差异显著(P <0. 05),在 3 个试验地之间则无明显差异(P >0. 05),腐解
率、固定碳与土壤温度和降水量都呈极显著正相关,挥发分与土壤温度、降水量呈显著负相关(P <0. 05)。玉米和
大豆秸秆还田有增加土壤碳含量的作用,作物秸秆种类、碳氮比、干湿程度以及土壤温度、降水条件都会影响作物
秸秆在土壤中的腐解率和组分变化。

Other Abstract

This study was about crop decomposition characteristic changes of corn and bean residues
(with different water conditions and C/N ratios) decomposition in the fields of three land uses (vineyard,
peach orchard,farmland),using nylon mesh bags method and thermogravimetry (TG),which can
provide a scientific basis for the rational use of straw resources. The results showed that at the early stage
of the decomposition (0 ~20 d),the decomposition rate was more than 20% and the decomposition rate
of bean straws was faster than that of corn straws. On 0 ~90 d of the decomposition,they were relatively
stable. Then the decomposition rates increased to 60% ~70% at the end (300 d). In TG-DTG curves,
the mass loss of 200 ~300℃ stage(20% ~30%) was caused by the corn straws during the decomposition
(20 ~45 d). At the end of decomposition,the 300 ~400℃ mass losses of bean straws were significantly
higher than those of corn straws. The values of 600 ~ 700℃ in TG and DTG curves at the end of the
decomposition (300 d) were about 6%. The decomposition rates and percentages of fixed carbon and
volatile matters were significantly different between fresh and dry treatments,corn residues and bean   residues,and low C/N ratio and high C/N ratio treatments (P < 0. 05). While,there were no obvious
differences in three different land uses (P > 0. 05). The decomposition rates and fixed carbon contents
were significantly positively related to soil temperature and precipitation (P < 0. 05),and volatile
matters were negatively correlated with soil temperature and precipitation (P < 0. 05). Corn and bean
straws in soils could increase the carbon content. Type,C/N ratio and water condition of crop residues,
and soil temperature and precipitation could affect the crop straw decomposition in the soil.

Keyword秸秆腐解 热重分析 腐解率
Indexed By中文核心期刊要目总览
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8563
Collection水保所知识产出(1956---)
Affiliation1.西北农林科技大学资源环境学院,陕西杨凌 712100
2.黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌 712100
Recommended Citation
GB/T 7714
曹莹菲,张 红,刘 克,等. 不同处理方式的作物秸秆田间腐解特性研究[J]. 农 业 机 械 学 报,2016,47(9):213-219.
APA 曹莹菲,张 红,刘 克,&吕家珑.(2016).不同处理方式的作物秸秆田间腐解特性研究.农 业 机 械 学 报,47(9),213-219.
MLA 曹莹菲,et al."不同处理方式的作物秸秆田间腐解特性研究".农 业 机 械 学 报 47.9(2016):213-219.
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