| 摘要: |
| [目的]研究立地条件对白羊草生态生理特征的影响,为黄土丘陵沟壑区水土保持、水分平衡分析、自然植被的人工模拟恢复提供理论依据.[方法]以天然白羊草群落为材料,对半阳坡和半阴坡两种立地条件下的白羊草草地土壤含水率、白羊草蒸腾强度、叶片相对含水量、水分饱和亏以及叶片持水力和白羊草群落地上、地下生物量进行了研究.[结果]两种立地条件下,0～200 cm土层的平均土壤含水率以半阴坡(10.30%)＞半阳坡(7.80%),二者差异达显著水平.两种立地条件下,白羊草蒸腾强度日变化趋势均为单峰型,且半阳坡的日均蒸腾强度大于半阴坡,蒸腾速率日变化规律与大气温度日变化规律基本一致.白羊草叶片相对含水量表现为半阴坡＞半阳坡,叶片失水百分率为半阳坡＞半阴坡,半阳坡水分亏缺较半阴坡严重.半阴坡白羊草群落总地上生物量(1 070.93 g/m2)高于半阳坡(1 020.50 g/m2),地下生物量表现为半阴坡(287.14 g/m2)低于半阳坡(726.77 g/m2).[结论]白羊草群落的水分生理生态特征与立地条件密切相关. |
| 关键词: 白羊草 陕北丘陵沟壑区 立地条件 水分饱和亏 群落生物量 |
| DOI： |
| 分类号:S124.2 Q591.5 |
| 基金项目:中国科学院西部行动计划项目（KZCX2-XB2-05）；国家自然科学基金“中国西部环境和生态科学重大研究计划”项目（90302005） |
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| Study on the water physiological ecology characteristics of Bothriochloa ischaemum in different habitats and community biomass in hilly-gully areas in Northern Shaanxi |
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LIU Yong-feng,ZAN Lin-sen,LIU Deng-ke,LIU Yang,LIU Yong-feng,ZAN Lin-sen,LIU Deng-ke,LIU Yang,LIU Yong-feng,ZAN Lin-sen,LIU Deng-ke,LIU Yang
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| Abstract: |
| 【Objective】 Effects of site type on the characteristic of eco-physiology of Bothriochloa ischaemum were investigated,which provided theoretical basis for the conservation of water and soil,the water balance analysis,natural vegetation's artificial simulation restoration.【Method】 This paper studied soil water content,transpiration intensity of Bothriochloa ischaemum relative,leaf water content,water saturated deficit,holding water capacity and aboveground and underground biomass under different habits.【Result】 The mean water content in 0~200 cm soi1 1ayer was 10.30% (semi-shady)，7.80% (semi-sunny),respectively．There was a significant discrepancy between semi-shady and semi-sunny hillsides (a=0.05).The daily transpiration intensity of Bothriochloa ischaemum changed into the unimodal curve in two habits,and the daily average transpiration intensity of Bothriochloa ischaemum in semi-sunny hillside was higher than semi-shady hillside.The diurnal variation of transpiration intensity was basically the same law with temperature diurnal variation.The leaf RWC of Bothriochloa ischaemum in semi-shady hillside was higher than semi-sunny hillside,but the leaf dehydration percentage of Bothriochloa ischaemum in semi-sunny hillside was higher than that in semi-shady hillside.The water deficit of Bothriochloa ischaemum in semi-shady hillside was more serious than semi-sunny hillside.The total aboveground biomass of Bothriochloa ischaemum community of semi-shady hillside was higher than that in semi-sunny hillside,they were 1 070.93 g/m2,1 020.50g/m2,respectively.The root biomass in semi-shady hillside was lower than that in semi-sunny hillside,they were 287.14 g/m2,726.77 g/m2,respectively. 【Conclusion】 There is a close relationship between the eco-physiology character of Bothriochloa ischaemum and the site type. |
| Key words: Bothriochloa ischaemum hillg-gully areas in Norhtem Shaanxi site conditions water saturation deficit community biomass |
