草业学报 ›› 2021, Vol. 30 ›› Issue (1): 181-188.DOI: 10.11686/cyxb2020066
收稿日期:
2020-02-21
修回日期:
2020-04-29
出版日期:
2021-01-20
发布日期:
2021-01-08
通讯作者:
李海燕,杨允菲
作者简介:
Corresponding author. E-mail: yangyf@nenu.edu.cn基金资助:
Lin YANG(), Mo CHEN, Hai-yan LI(), Yun-fei YANG()
Received:
2020-02-21
Revised:
2020-04-29
Online:
2021-01-20
Published:
2021-01-08
Contact:
Hai-yan LI,Yun-fei YANG
摘要:
作为全球气候变化的重要组成部分,降雨格局变化能够对各类植物产生不同的影响。虎尾草为退化盐碱草地恢复的主要先锋种植物之一,降雨格局变化如何影响其分株和根系等特征对于全球变化背景下退化盐碱地的生态恢复至关重要。本研究通过人工模拟降雨格局变化试验,设置了3个降水量(减少30%、不变、增加30%)和2个降雨间隔(1、2 d), 研究了虎尾草地上分株和地下根系形态特征对降雨格局变化的响应。结果表明:1) 降雨格局的变化对虎尾草有性生殖特征几乎无影响,随着降水量增加或降雨间隔延长营养繁殖特征具有增加的趋势。2) 降雨间隔和降水量对虎尾草根系影响程度不同,降雨间隔为主要影响因素,且二者相互依赖。降水量一定时,随着降雨间隔的增加,总根长、总表面积、总体积和根直径显著降低。3) 降水量和降雨间隔均影响虎尾草生物量的积累,降雨间隔为主要影响因素,随着降雨间隔的增加,根、茎、总生物量均显著降低,叶和花序生物量具有减小的趋势,但是影响不显著。
杨林, 陈默, 李海燕, 杨允菲. 模拟降雨格局变化对虎尾草分株和根系特征的影响[J]. 草业学报, 2021, 30(1): 181-188.
Lin YANG, Mo CHEN, Hai-yan LI, Yun-fei YANG. Effect of simulated changes in rainfall patterns on characteristics of ramets and roots of Chloris virgata[J]. Acta Prataculturae Sinica, 2021, 30(1): 181-188.
降水量Rainfall amount (mL) | 降雨间隔Rainfall interval (d) | |||
---|---|---|---|---|
W- | W | W+ | T | T+ |
24.5 | 35.1 | 45.6 | 1 | 2 |
72.7 | 103.8 | 135.0 | 1 | 2 |
表1 模拟降雨格局处理的降水量和降雨间隔
Table 1 Simulated rainfall amount and rainfall interval treatment
降水量Rainfall amount (mL) | 降雨间隔Rainfall interval (d) | |||
---|---|---|---|---|
W- | W | W+ | T | T+ |
24.5 | 35.1 | 45.6 | 1 | 2 |
72.7 | 103.8 | 135.0 | 1 | 2 |
因子Factor | 分蘖数TN | 株高PH | 穗长SL | 生殖生长比率RRA | 总根长TRL | 根总表面积TRSA | 根直径RD | 根总体积TRV |
---|---|---|---|---|---|---|---|---|
T | 0.432 | 10.647** | 0.887 | 1.935 | 4.276* | 4.771* | 4.322* | 5.050* |
W | 1.924 | 4.118* | 1.967 | 4.145* | 2.172 | 2.259 | 0.529 | 2.275 |
T×W | 0.219 | 0.494 | 0.253 | 1.034 | 0.016 | 0.027 | 0.105 | 0.039 |
表2 降雨格局变化对虎尾草分株和根系形态特性影响的双因素方差分析
Table 2 Two-way ANOVA analysis of the effects of rainfall pattern changes on ramet and the root morphological characteristics of C. virgata
因子Factor | 分蘖数TN | 株高PH | 穗长SL | 生殖生长比率RRA | 总根长TRL | 根总表面积TRSA | 根直径RD | 根总体积TRV |
---|---|---|---|---|---|---|---|---|
T | 0.432 | 10.647** | 0.887 | 1.935 | 4.276* | 4.771* | 4.322* | 5.050* |
W | 1.924 | 4.118* | 1.967 | 4.145* | 2.172 | 2.259 | 0.529 | 2.275 |
T×W | 0.219 | 0.494 | 0.253 | 1.034 | 0.016 | 0.027 | 0.105 | 0.039 |
因子 Factor | 根生物量 Root biomass | 茎生物量 Stem biomass | 叶生物量 Leaf biomass | 花序生物量 Inflorescence biomass | 总生物量 Total biomass |
---|---|---|---|---|---|
T | 6.621* | 2.838 | 1.923 | 1.084 | 2.993 |
W | 2.531 | 4.000* | 2.882 | 0.112 | 3.472* |
T×W | 0.315 | 0.024 | 0.088 | 0.050 | 0.012 |
表3 降雨格局变化对虎尾草生物量影响的双因素方差分析
Table 3 Two-way ANOVA analysis of the effects of rainfall pattern changes on biomass of C. virgata
因子 Factor | 根生物量 Root biomass | 茎生物量 Stem biomass | 叶生物量 Leaf biomass | 花序生物量 Inflorescence biomass | 总生物量 Total biomass |
---|---|---|---|---|---|
T | 6.621* | 2.838 | 1.923 | 1.084 | 2.993 |
W | 2.531 | 4.000* | 2.882 | 0.112 | 3.472* |
T×W | 0.315 | 0.024 | 0.088 | 0.050 | 0.012 |
降雨间隔 Rainfall interval | 降水量 Rainfall amount | 根生物量 Root biomass | 茎生物量 Stem biomass | 叶生物量 Leaf biomass | 花序生物量 Inflorescence biomass | 总生物量 Total biomass |
---|---|---|---|---|---|---|
T | W- | 0.143 | 0.635 | 0.517 | 0.070 | 1.365 |
W | 0.182 | 0.882 | 0.674 | 0.071 | 1.810 | |
W+ | 0.236 | 1.091 | 0.813 | 0.073 | 2.213 | |
T+ | W- | 0.096 | 0.452 | 0.358 | 0.050 | 0.956 |
W | 0.122 | 0.626 | 0.593 | 0.060 | 1.402 | |
W+ | 0.143 | 0.877 | 0.648 | 0.062 | 1.731 |
表4 降雨格局变化对虎尾草生物量影响的多重比较
Table 4 Multiple comparisons of effect of rainfall pattern changes on the biomass of C. virgata (g·plant-1)
降雨间隔 Rainfall interval | 降水量 Rainfall amount | 根生物量 Root biomass | 茎生物量 Stem biomass | 叶生物量 Leaf biomass | 花序生物量 Inflorescence biomass | 总生物量 Total biomass |
---|---|---|---|---|---|---|
T | W- | 0.143 | 0.635 | 0.517 | 0.070 | 1.365 |
W | 0.182 | 0.882 | 0.674 | 0.071 | 1.810 | |
W+ | 0.236 | 1.091 | 0.813 | 0.073 | 2.213 | |
T+ | W- | 0.096 | 0.452 | 0.358 | 0.050 | 0.956 |
W | 0.122 | 0.626 | 0.593 | 0.060 | 1.402 | |
W+ | 0.143 | 0.877 | 0.648 | 0.062 | 1.731 |
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