| 温美娟,杨思存,王成宝,霍琳,姜万礼.深松和秸秆还田对灌耕灰钙土团聚体特征的影响[J].干旱地区农业研究,2020,38(2):78~85 |
| 深松和秸秆还田对灌耕灰钙土团聚体特征的影响 |
| Effects of subsoiling and straw returning on soil aggregates of irrigated sierozem farmland |
| |
| DOI：10.7606/j.issn.1000-7601.2020.02.11 |
| 中文关键词: 土壤团聚体 深松 秸秆还田 灌耕灰钙土 |
| 英文关键词:soil aggregate subsoiling straw returning irrigated sierozem soil |
| 基金项目:农业部公益性行业（农业）科研专项（201503117）；甘肃省农业科学院科技创新专项(2015GAAS03) |
|
| 摘要点击次数: 774 |
| 全文下载次数: 535 |
| 中文摘要: |
| 2015—2017年设置传统旋耕秸秆不还田(RT)、深松35 cm秸秆不还田(ST)及深松35 cm秸秆还田(STS)3个处理，应用干筛法和湿筛法对0～40 cm土层团聚体数量、组成和稳定性进行研究。结果表明，STS能促进土壤大团聚体的形成并促进团聚体的稳定，深松和秸秆还田均可显著影响团聚体数量和大小（P<0.05）、促进不同粒级团聚体更新转化。干筛法下，0～40 cm土层，STS处理最佳，＞0.25 mm机械稳定性团聚体含量（DR0.25）、平均质量直径（MWD）、平均几何直径（GMD）较RT分别增加3.0%、9.5%和15.5%，分形维数（D）降低4.5%。湿筛法下，STS处理的WR0.25（＞0.25 mm水稳性团聚体含量）、MWD、GMD较RT分别增加45.2%、12.0%和9.1%，D值降低1.1%。干筛法和湿筛法下，不同土层均以0～10 cm 土层R0.25（直径＞0.25 mm团聚体含量）、MWD、GMD值STS较RT的增幅最大，干筛法下，分别增加8.6%、18.0%、25.3%，湿筛法下，分别增加67.7%、25.0%、12.5%，此外，STS较RT和ST处理可显著降低0～40 cm土层团聚体破坏率（PAD）和不稳定团粒指数（ELT），PAD分别降低8.6%、2.4%，ELT降低7.0%、1.5%。综合分析认为，STS更有利于土壤团聚体含量的增加及土壤结构的形成与稳定。 |
| 英文摘要: |
| Three treatments were set up in 2015-2017 including traditional rotary tillage without straw returning (RT), subsoiling 35 cm without straw returning (ST), and subsoiling 35 cm straw returning (STS).Samples were collected from 0~40 cm soil layer and dry screening and wet sieve methodsused for studying the composition of soil aggregates, the number of aggregates > 0.25 mm (R0.25), the average weight diameter (MWD), the geometric mean diameter (GMD), the aggregate destruction rate (PAD), the aggregate instability coefficient (ELT), and the fractal dimension (D). The results showed that comparing with RT and ST, STS promoted the formation and stability of aggregates in 0~40 cm soil layer, and the number and size of aggregates were significantly affected by subsoiling and straw returning (P<0.05), which promoted the renewal and transformation of aggregates with different particle size. In 0~40 cm soil layer, with dry sieving method, DR0.25 (＞0.25 mm mechanical stability aggregate content), MWD, and GMD of STS increased by 3.0%, 9.5%, and 15.5% and the fractal dimension decreased by 4.5% compared with RT. With wet sieving method, WR0.25 (＞0.25 mm water stable aggregate content), MWD, and GMD of STS increased by 45.2%, 12.0%, and 9.1% comparing with RT, and the fractal dimension decreased by 1.1% compared to RT. Meanwhile, in stratification, the amplification of STS in 0~10 cm soil layer was the largest than that of RT, with DR0.25, MWD, and GMD was 8.6%, 18.0%, and 25.3%, respectively, in dry sieving method. Wet sieving was the same as the dry sieve, and in 0~10 cm soil layer, the amplification of STS of DR0.25, MWD, and GMD increased 67.7%, 25.0%, and 12.5% comparing to that of RT. In addition, STS significantly decreased PAD and ELT compared ST and RT in 0~40 cm soil layer, PAD decreased by 8.6% and 2.4%, ELT decreased by 7.0% and 15%, respectively. Overall,STS promoted the increase of content and stability of soil aggregate, and also promoted the formation and stability of soil structure. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| | |