ISWC OpenIR  > 水保所知识产出(1956---)
黄土高原撂荒地植物群落共存种光合 特性对土壤水分变化的响应
周敏1; 杜峰1,2; 张赟赟1; 潘天辉1
2020
发表期刊草业学报
卷号29期号:1页码:50-62
摘要

植物群落共存种的环境适应性和相对竞争能力差异是植物群落动态和演替的两个决定性因素,其中光合特
性与二者都有紧密关联,因此研究群落共存种光合特性的差异对理解群落演替机理具有重要意义。以黄土丘陵区
10 种主要的撂荒地植物群落共存种为研究对象,测定其在不同的生长月份( 8-10 月)和不同水分条件下(适宜水
分及中度、重度干旱胁迫)光合速率、蒸腾速率和水分利用效率等的变化,分析植物群落共存种光合特性对土壤水
分变化的响应。结果表明: 1 ) 3种水分条件下,无芒隐子草、白羊草、小花棘豆和达乌里胡枝子的净光合速率日变化
均呈单峰曲线,而冰草和阿尔泰狗娃花的则呈双峰曲线,有光合“午休”现象, 10种群落共存种以无芒隐子草的日光
合能力峰值最大,冰草的最小; 2 )除中华隐子草和阿尔泰狗娃花外,多数种的蒸腾速率日变化在3种水分条件下均
呈单峰曲线,其中,无芒隐子草的日蒸腾能力峰值最大,小花棘豆的最小; 3 )日均净光合速率和日均蒸腾速率存在
显著种间差异和生长月份差异( P <0.
05 ),其中,无芒隐子草的日均净光合速率和日均蒸腾速率最大,而日均水分
利用效率在不同物种和生长月份之间则无显著差异( P >0.
05 ); 4 )在演替生态位置上, 10种群落共存种以演替前期
种的日均蒸腾速率和日均水分利用效率相对较低,而演替后期种相对较高,表明演替后期的植物水分利用性能较
高。在干旱半干旱的黄土高原丘陵区,伴随演替进程的土壤环境旱化,演替后期序列种凭借其较高的水分利用能
力,将在撂荒地群落中占据优势地位,从而逐渐代替演替前期种。

其他摘要

Differences in environmental adaptability and relative competitive ability of co - existing species are two
key factors driving
community dynamics and succession.Photosynthetic responses are closely
linked to adapta -
bility
and competitive ability.Therefore , it is useful to study the differences in photosynthetic characteristics of
co - existing species to help understand the mechanisms of community succession.In this study , 10co - existing
plant species in middle secondary successional stages in Loess Plateau vegetation were studied.The species
studied were Heteropappusaltaicus , Artemisia 
scoparia , Artemisia sacrorum , Artemisia giraldii , Oxytropis
glabra , Lespedeza dahurica , Bothriochloa ischaemum , Agropyron cristatum , Cleistogenes chinessis , and
Cleistogenes songorica .Their photosynthetic rate , transpiration rate and water use efficiency under different
water treatments ( severe , moderate and mild water deficit ) were measured in August , September and Octo -
ber , with the aim of categorizing the differences among these plant species in photosynthetic response to varia -
tion in soil moisture.The results showed that : 1 ) Under all water conditions , the diurnal variation of net pho -
tosynthetic rate of C . songorica , B . ischaemum , O . glabra and L . dahurica showed a diurnally
unimodal
curve , while A . cristatum and H . altaicus showed bimodal curves with an obvious midday depression of photo -
synthesis.The diurnal peak of C . songorica had the highest amplitude , while that of A .
cristatum had the low -
est.2 ) The diurnal variation in transpiration rate of most species followed a single - peaked curve under all water
conditions , with the main exception being C . chinessis and H . altaicus .Again , the peak of C . songorica had
the largest amplitude , while O . glabra had the lowest.3 ) There were significant inter - species and growing sea -
son differences in daily average net photosynthetic rate and transpiration rate (
P <0. 05 ), while differences in
daily average water use efficiency
were not obvious ( P >0. 05 ) .Among the 10co - existing species , C . songorica
had the highest daily average net photosynthesis and transpiration rates.4
) With respect to the ecological suc

cessional sequence , the daily average water use efficiency of the early - succession species were relatively low ,
while values for the post - succession species were relatively high , meaning that the water use performance of the
late - succession species was higher.Considering the arid conditions in this region of the Loess Plateau , and their
likely impact on the succession process
, the logical expectation is that late
- succession species will , through
their water use characteristics , gradually occupy a dominant position in their plant communities , and thus grad -
ually replace the early
- succession species in the arid and semi - arid hilly region of the Loess Plateau.

关键词群落共存种 光合特性 土壤水分 净光合速率 蒸腾速率
收录类别中文核心期刊要目总览
语种中文
文献类型期刊论文
条目标识符sbir.nwafu.edu.cn/handle/361005/9993
专题水保所知识产出(1956---)
作者单位1.西北农林科技大学林学院
2.中国科学院水利部水土保持研究所
推荐引用方式
GB/T 7714
周敏,杜峰,张赟赟,等. 黄土高原撂荒地植物群落共存种光合 特性对土壤水分变化的响应[J]. 草业学报,2020,29(1):50-62.
APA 周敏,杜峰,张赟赟,&潘天辉.(2020).黄土高原撂荒地植物群落共存种光合 特性对土壤水分变化的响应.草业学报,29(1),50-62.
MLA 周敏,et al."黄土高原撂荒地植物群落共存种光合 特性对土壤水分变化的响应".草业学报 29.1(2020):50-62.
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