张惠, 王小林, 常苗苗, 等. 毛乌素沙地樟子松人工林生理生态特征对灌水强度的响应[J]. 西南林业大学学报(自然科学), 2024, 44(4): 86–92. DOI: 10.11929/j.swfu.202309021
引用本文: 张惠, 王小林, 常苗苗, 等. 毛乌素沙地樟子松人工林生理生态特征对灌水强度的响应[J]. 西南林业大学学报(自然科学), 2024, 44(4): 86–92. DOI: 10.11929/j.swfu.202309021
Zhang Hui, Wang Xiaolin, Chang Miaomiao, Ye Runhong, Wang Jie, Zhang Zening. Response of Physiological and Ecological Characteristics of Pinus sylvestris var. mongolica to Irrigation Intensity in Mu Us Sandy Land[J]. Journal of Southwest Forestry University, 2024, 44(4): 86-92. DOI: 10.11929/j.swfu.202309021
Citation: Zhang Hui, Wang Xiaolin, Chang Miaomiao, Ye Runhong, Wang Jie, Zhang Zening. Response of Physiological and Ecological Characteristics of Pinus sylvestris var. mongolica to Irrigation Intensity in Mu Us Sandy Land[J]. Journal of Southwest Forestry University, 2024, 44(4): 86-92. DOI: 10.11929/j.swfu.202309021

毛乌素沙地樟子松人工林生理生态特征对灌水强度的响应

Response of Physiological and Ecological Characteristics of Pinus sylvestris var. mongolica to Irrigation Intensity in Mu Us Sandy Land

  • 摘要: 针对干旱胁迫导致毛乌素沙地人工林早衰的潜在风险,以6年生樟子松为研究对象,设置3个灌水梯度,灌水量分别为近5年平均降水量(487.56 mm)的2倍、3倍和4倍,3次重复,分析樟子松光合指标、生理指标与灌水强度的关系,摸清光合、水分生理特征对土壤水分状况的响应规律。结果表明:随着灌水强度的增加,生长能力、组织含水率和光合生理性能分别以43.20%、1.40%和37.60%呈先增后减的变化趋势,而丙二醛和超氧自由基的含量随生育期延伸显著增加27.28%和136.59%;同时随灌水量增加显著降低7.5%和18.15%。生长能力与组织含水率、光合速率呈正相关,与超氧阴离子、丙二醛含量呈负相关;而且,光合速率与组织含水率呈正相关,而超氧阴离子和丙二醛的含量则与组织含水率呈负相关;超氧阴离子和丙二醛含量显著反映樟子松适应季节干旱和土壤干旱的生理关联。根据回归分析估计,毛乌素沙地6年生樟子松人工林的适宜灌水强度应为当地降水量的2.5~3.5倍。由此说明,灌水强度、组织含水率、光合生理和水分生理、生长能力是一个连续驱动的过程,灌水强度具有调节樟子松抗旱机能、改善生理适应性的关键作用,是改善林地水分条件是延缓或避免樟子松人工林早衰的关键。

     

    Abstract: The potential risk of premature aging of plantation in Mu Us Sandy land caused by drought stress, 3 irrigation gradients were set with 6-year-old Pinus sylvestris var. mongolica, and the irrigation amount was 2 times, 3 times and 4 times of the average precipitation of recent 5 years(487.56 mm), respectively. The relationship between photosynthetic index, physiological index and irrigation intensity was analyzed, and the response of physiological characteristics of photosynthesis and water to soil water status was found out. The findings indicated that with the increase of irrigation intensity, the growth capacity, tissue moisture content, photosynthetic physiological indexes increased first and then decreased at 43.20 %, 1.40 % and 37.60 %, respectively, and the content of malondialdehyde and superoxide free radical increased significantly by 27.28 % and 136.59 % with the extension of growth period, and it decreased significantly by 7.5 % and 18.15 % with the increase of irrigation amount. Growth capacity was positively correlated with tissue water content and photosynthetic rate, and negatively correlated with superoxide anion and malondialdehyde content. Furthermore, the photosynthetic rate was positively correlated with tissue water content, while the content of superoxide anion and malondialdehyde was negatively correlated with tissue water content. According to regression analysis, the optimal irrigation intensity of 6 a P. sylvestris var. mongolica plantation in Mu Us Sandy Land was 2.5–3.5 times of the local precipitation. These results indicated that irrigation intensity, tissue moisture content, photosynthetic physiology, water physiology and growth ability were integrated as a continuous driving process. Irrigation intensity played a key role in regulating drought resistance function and improving physiological adaptability of P. sylvestris var. mongolica plantation, and also a efficient way to improving forest water condition and delaying or avoiding premature aging of P. sylvestris var. mongolica plantation.

     

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