| 李婷,李冰冰,李志.黄土区深剖面苹果树根系与土壤水分特征及其相互作用[J].干旱地区农业研究,2023,(4):126~132 |
| 黄土区深剖面苹果树根系与土壤水分特征及其相互作用 |
| Characteristics and interactions of apple tree root system and soil water in deep profile of Loess Region |
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| DOI：10.7606/j.issn.1000-7601.2023.04.13 |
| 中文关键词: 根系分布；土壤水分 土地利用变化；深剖面；黄土区 |
| 英文关键词:root distribution soil water land use change deep profile Loess Region |
| 基金项目:国家自然科学基金(42071043)；中央高校基本科研业务费专项资金(2452020002) |
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| 中文摘要: |
| 为实现黄土区深层土壤水的合理开发利用，需探明土地利用变化下深剖面根系和土壤水分特征及其相互作用。以农地(F)为对照，分析5、8、11、15、18、22、26 a共7个种植年限（分别以A5、A8、A11、A15、A18、A22、A26表示）下苹果树地10 m深剖面根系和土壤水分特征。结果表明：农地、<10 a和>10 a苹果树0~10 m深剖面细根根长密度(FRLD)累积分数(Y)为0.50和0.95的分布深度(D50和D95)分别为20 cm和160 cm、80 cm和610 cm、512 cm和884 cm；根系分布消光系数(β)均值分别为0.962、0.995和0.998。农地转为苹果树地后，0~10 m深剖面土壤含水量(SWC)和土壤储水量(SWS)均随种植年限增加而逐渐降低，而土壤水分亏缺程度(SWCD)和果树耗水深度则逐渐增加。D50和SWC/SWS在0~10 m土层呈负相关关系(r2=0.6)，和SWCD呈正相关关系(r2=0.3)。FRLD和Y分别适用于表征浅根植被和深根植被下土壤水分状况。农地0~3 m土层的FRLD可以解释70%~80%的SWC和SWS变异；而≥15 a苹果树地0~10 m土层的Y仅可解释30%的SWCD变异。研究结果可为水资源有限且非饱和带深厚的干旱半干旱地区的苹果树灌溉策略制定和根系吸水模拟的参数化过程提供参考。 |
| 英文摘要: |
| It is necessary to explore the characteristics of root system and soil water in the deep profile and their interaction under different land use types for the sustainable development and utilization of deep soil water in the loess region. This study used farmland (F) as a control to analyze the characteristics of root and soil water in the 10 m deep profile of apple trees with seven ages (A5, A8, A11, A15, A18, A22, and A26). The results showed that root depth for a cumulative fraction (Y) of fine root length density (FRLD) at 0.50 and 0.95 (D50 and D95) of 10 m deep profile under F, apple tree <10 a and >10 a was 20 cm and 160 cm, 80 cm and 610 cm, 512 cm and 884 cm. The corresponding mean values of root distribution extinction coefficient (β) were 0.962, 0.995, and 0.998, respectively. The soil water content (SWC) and soil water storage (SWS) gradually decreased with the increase of apple tree ages in the 10 m deep profile, while soil water deficit degree (SWCD) and water consumption depth gradually increased. D50 showed a negative linear correlation with SWC/SWS at 0~10 m soil layers (r2=0.6), while it showed a positive linear correlation with SWCD (r2=0.3). FRLD and Y were suitable for characterizing soil moisture status under shallow\|rooted and deep\|rooted vegetation, respectively. The FRLD in the 0~3 m soil layer under F explained 70%~80% of the SWC and SWS variation, while the Y of apple trees ≥15 a in the 0~10 m soil layer only explained 30% of the SWCD variation. The results provided information for the formulation of irrigation strategies for apple trees and the parameterization of root water uptake simulations, especially in arid and semi\|arid regions with limited water resources and deep unsaturated zones. |
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