中国农业科学 ›› 2020, Vol. 53 ›› Issue (16): 3307-3318.doi: 10.3864/j.issn.0578-1752.2020.16.009
收稿日期:
2019-09-26
接受日期:
2019-12-30
出版日期:
2020-08-16
发布日期:
2020-08-27
通讯作者:
李桂花,张建峰
作者简介:
周吉祥,E-mail:基金资助:
ZHOU JiXiang(),ZHANG He,YANG Jing,LI GuiHua(
),ZHANG JianFeng(
)
Received:
2019-09-26
Accepted:
2019-12-30
Online:
2020-08-16
Published:
2020-08-27
Contact:
GuiHua LI,JianFeng ZHANG
摘要:
【目的】以河北省廊坊市小麦-玉米轮作区沙质潮土为研究对象,通过2015—2018年田间连续定位试验,研究两种土壤改良剂对土壤活性有机碳组分含量和土壤碳库管理指数的影响,以期为沙质潮土有机碳库培育,改善土壤质量提供理论依据。【方法】试验采用单因素随机区组设计,设4个处理:(1)单施化肥(CK);(2)CK+有机改良剂15 t·hm-2(T1);(3)CK+无机改良剂2.25 t·hm-2(T2);(4)CK+有机改良剂15 t·hm-2+无机改良剂2.25 t·hm-2(T3)。收获季测定土壤有机碳、全氮、pH、速效磷、速效钾,并运用修正的内梅罗指数法计算土壤综合肥力指数(IFI)。再分析活性有机碳各组分含量,并计算碳库管理指数(CPMI)。最后通过CPMI和IFI指示指标评价连续施用土壤改良剂对沙质潮土改良的应用效果。【结果】较CK处理,施用有机改良剂处理土壤总有机碳(TOC)和土壤综合肥力指数(IFI)均显著提高,尤其是有机无机改良剂配施时效果最显著;施用有机改良剂处理各活性碳组分含量均呈升高趋势,并且活性有机碳各组分含量呈现为:易氧化有机碳(LOC)>可溶性有机碳(DOC)>微生物量碳(MBC);施用有机改良剂各处理土壤活性碳库组分有效率均呈下降趋势,T1、T3处理土壤易氧化有机碳有效率(LOC/TOC)较CK分别显著降低了12.57%和12.02%,微生物量碳有效率(MBC/TOC)较CK分别显著降低了12.84%和12.30%,单施无机改良剂处理较CK无显著影响,说明施用有机改良剂增加活性有机碳各组分含量的同时,向土壤中输入了更多的稳定态碳,进而导致有效率的降低;施用有机改良剂各处理土壤碳库指数显著升高、碳库活度显著降低,说明施用有机土壤改良剂能够促进土壤碳库的积累;施用有机改良剂各处理土壤碳库管理指数均呈升高趋势。主成分分析结果表明,施用有机改良剂能够影响土壤中活性碳各组分含量及其有效率。【结论】连续施用有机改良剂能够显著提高沙质潮土肥力,增加土壤碳库管理指数,累积碳库库容,改善土壤质量。
周吉祥,张贺,杨静,李桂花,张建峰. 连续施用土壤改良剂对沙质潮土肥力及活性有机碳组分的影响[J]. 中国农业科学, 2020, 53(16): 3307-3318.
ZHOU JiXiang,ZHANG He,YANG Jing,LI GuiHua,ZHANG JianFeng. Effects of Continuous Application of Soil Amendments on Fluvo- Aquic Soil Fertility and Active Organic Carbon Components[J]. Scientia Agricultura Sinica, 2020, 53(16): 3307-3318.
表2
不同土壤改良剂各处理养分输入量"
处理 Treatment | TN (kg·hm-2) | TP (kg·hm-2) | TK (kg·hm-2) |
---|---|---|---|
CK | 150 | 52.39 | 46.68 |
T1 | 370.5 (150+220.5) | 368.14 (52.39+315.75) | 389.88 (46.68+343.2) |
T2 | 150.15 (150+0.15) | 52.58 (52.39+0.185) | 46.70 (46.68+0.024) |
T3 | 370.65 (150+220.5+0.15) | 368.33 (52.39+315.75+0.185) | 389.90 (46.68+343.2+0.024) |
表4
土壤改良剂对土壤化学特性及肥力水平的影响"
处理Treatment | 有机碳 TOC (g·kg-1) | 全氮 TN (g·kg-1) | 速效磷 AP (mg·kg-1) | 速效钾 AK (mg·kg-1) | pH | 土壤综合肥力指数 IFI |
---|---|---|---|---|---|---|
CK | 7.41±0.41b | 0.92±0.15ab | 22.76±6.85b | 213.67±18.23d | 8.65±0.09a | 1.15±0.07b |
T1 | 9.51±0.34a | 1.14±0.21ab | 78.24±1.50a | 307.33±28.02b | 8.30±0.02b | 1.33±0.04a |
T2 | 7.77±0.34b | 0.84±0.21b | 24.94±3.12b | 256.00±15.10c | 8.43±0.09b | 1.17±0.04b |
T3 | 9.84±0.62a | 1.18±0.10a | 80.61±16.68a | 372.00±21.00a | 8.37±0.06b | 1.35±0.03a |
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