ISWC OpenIR  > 水保所知识产出(1956---)
混播下柳枝稷叶绿素荧光参数及 对水氮条件的响应特征
霍丽娟1; 丁文利1; 高志娟1; 苏国霞1; 王智1,2
2016
Source Publication西北植物学报
Volume36Issue:4Pages:757-765
Abstract

采用盆栽试验,按照白羊草(Bothriochloa ischaemum)与柳枝稷(Panicum virgatum)株数比设置5个混
播比例(0∶8、2∶6、4∶4、6∶2、8∶0),在两种氮肥处理(不施氮和0.1g N·kg-1)下,测定分析柳枝稷叶绿素荧光
参数对土壤水分短期自然干旱并复水[土壤含水量从80% FC(田间持水量为20%)逐渐降至20% FC后再复水
至80% FC]的响应,以期揭示不同水氮及混播比例下柳枝稷与白羊草竞争关系的生理生态机制。结果显示:(1)
随干旱胁迫加剧,柳枝稷最大光化学效率(Fv/Fm)、光化学猝灭(qP)、实际光化学效率(ΦPSⅡ)和表观光合量子传
递速率(ETR)逐渐下降,复水后第2天各指标均可恢复到对照水平;(2)两氮肥处理下,单播柳枝稷的ETR 显著
高于混播,施氮处理下单播的qP 显著高于混播,但非光化学猝灭系数(NPQ)相反(P<0.05),且柳枝稷比例越小
各指标降幅越大,表明混播后柳枝稷PSⅡ反应中心活性下降,显示出其对混播竞争的适应;(3)施氮显著提高了柳
枝稷的ΦPSⅡ(13.64%~23.53%)和qP (6.12%~11.11%),降低了NPQ 值(9.76%~12.82%)(P<0.05),表明
施氮可提高其光能利用能力,增强其与白羊草的竞争力。研究认为,不同水氮条件下,柳枝稷表现出较强的混播竞
争适应性,施氮会提高其对白羊草的生态竞争能力。

Other Abstract

To clarify the physiological characteristics of switchgrass as an introduced species in semiarid region,
we investigated its leaf fluorescence characteristics when mixed with old world bluestem at five densities(
i.e.0∶8,2∶6,4∶4,6∶2,8∶0)under short-term water stress[soil moisture contents declined
from 80%to 20% FC(field capacity is 80%)and then rehydrate to 80%FC]and two nitrogen treatments
(N0and 0.1g N·kg-1 addition)in a pot experiment.Results showed that:(1)The maximal photochemical
efficiency(Fv/Fm),PSⅡactual quantum yield(ΦPSⅡ),apparent electron transport rate(ETR)andphotochemical quenching coefficient(qP)of switchgrass decreased gradually with soil water drying,and
recovered to the same level as with the control plants in the second day after re-watering.(2)ETRvalue
of switchgrass was significantly higher in monoculture under both N fertilizer treatments,and qP value
was significantly higher in monoculture than those in mixture under nitrogen addition treatment,and vise
versa for non-photochemical quenching coefficient(NPQ)value,indicating that the activity of PSⅡreaction
declined in mixture,and switchgrass had higher competition ability under mixture.(3)ΦPSⅡ and qP
values of switchgrass increased 13.64%-23.53%and 6.12%-11.11%,respectively,and NPQvalue decreased
9.76%-12.82%under N addition treatment,which indicated that N could improve the light energy
use efficiency and competitive ability of switchgrass.Our results suggested that switchgrass have strong
adaptation when mixed with old world bluestem under different soil water and N application treatments,
and N addition could increase its competitive ability to the component species.

Keyword柳枝稷 混播比例 抗旱性 旱后复水 氮肥
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/361005/8744
Collection水保所知识产出(1956---)
Affiliation1.西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室
2.中国科学院水利部水土保持研究所
Recommended Citation
GB/T 7714
霍丽娟,丁文利,高志娟,等. 混播下柳枝稷叶绿素荧光参数及 对水氮条件的响应特征[J]. 西北植物学报,2016,36(4):757-765.
APA 霍丽娟,丁文利,高志娟,苏国霞,&王智.(2016).混播下柳枝稷叶绿素荧光参数及 对水氮条件的响应特征.西北植物学报,36(4),757-765.
MLA 霍丽娟,et al."混播下柳枝稷叶绿素荧光参数及 对水氮条件的响应特征".西北植物学报 36.4(2016):757-765.
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