Reforestation Based on Mono-Plantation of Fast-Growing Tree Species Make It Difficult to Maintain (High) Soil Water Content in Tropics, a Case Study in Hainan Island, China
Reforestation has been assumed as a natural solution to recover soil water content, thereby increasing freshwater supply. Mono-plantation of fast-growing species is the first step for performing reforestation to prevent frequent and heavy rain-induced landslide in tropics. However, fast-growing spec...
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MDPI AG
2020-11-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/12/11/3077 |
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| author | Wenjun Hong Jindian Yang Jinhuan Luo Kai Jiang Junze Xu Hui Zhang |
| author_facet | Wenjun Hong Jindian Yang Jinhuan Luo Kai Jiang Junze Xu Hui Zhang |
| author_sort | Wenjun Hong |
| collection | DOAJ |
| description | Reforestation has been assumed as a natural solution to recover soil water content, thereby increasing freshwater supply. Mono-plantation of fast-growing species is the first step for performing reforestation to prevent frequent and heavy rain-induced landslide in tropics. However, fast-growing species may have negative hydraulic response to seasonal drought to maintain high growth rate and, thus, may make it difficult for reforestation in tropics to recover soil water content. We tested this hypothesis in a setting involving (a) a reforestation project, which mono-planted eight fast-growing tree species to successfully restore a 0.2-km<sup>2</sup> extremely degraded tropical rainforest, and (b) its adjacent undisturbed tropical rainforest in Sanya City, Hainan, China. We found that, for maintaining invariably high growth rates across wet to dry seasons, the eight mono-planted fast-growing tree species had comparable transpiration rates and very high soil water uptake, which in turn led to a large (3 times) reduction in soil water content from the wet to dry seasons in this reforested area. Moreover, soil water content for the adjacent undisturbed tropical rainforest was much higher (1.5 to 5 times) than that for the reforested area in both wet and dry seasons. Thus, the invariably very high water demand from the wet to dry seasons for the mono-planted fast-growing species possesses difficulty in the recovery of soil water content. We suggest, in the next step, to mix many native-species along with the currently planted fast-growing nonnative species in this reforestation project to recover soil water content. |
| first_indexed | 2024-03-10T15:07:52Z |
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| id | doaj.art-4627672a1fbf45509f4e00a7de8001e4 |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-10T15:07:52Z |
| publishDate | 2020-11-01 |
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| series | Water |
| spelling | doaj.art-4627672a1fbf45509f4e00a7de8001e42023-11-20T19:35:06ZengMDPI AGWater2073-44412020-11-011211307710.3390/w12113077Reforestation Based on Mono-Plantation of Fast-Growing Tree Species Make It Difficult to Maintain (High) Soil Water Content in Tropics, a Case Study in Hainan Island, ChinaWenjun Hong0Jindian Yang1Jinhuan Luo2Kai Jiang3Junze Xu4Hui Zhang5Sanya Academy of Forestry, Sanya 572000, ChinaSanya Academy of Forestry, Sanya 572000, ChinaSanya Academy of Forestry, Sanya 572000, ChinaCollege of Forestry/Wuzhishan National Long Term Forest Ecosystem Monitoring Research Station, Hainan University, Haikou 570228, ChinaSanya Academy of Forestry, Sanya 572000, ChinaCollege of Forestry/Wuzhishan National Long Term Forest Ecosystem Monitoring Research Station, Hainan University, Haikou 570228, ChinaReforestation has been assumed as a natural solution to recover soil water content, thereby increasing freshwater supply. Mono-plantation of fast-growing species is the first step for performing reforestation to prevent frequent and heavy rain-induced landslide in tropics. However, fast-growing species may have negative hydraulic response to seasonal drought to maintain high growth rate and, thus, may make it difficult for reforestation in tropics to recover soil water content. We tested this hypothesis in a setting involving (a) a reforestation project, which mono-planted eight fast-growing tree species to successfully restore a 0.2-km<sup>2</sup> extremely degraded tropical rainforest, and (b) its adjacent undisturbed tropical rainforest in Sanya City, Hainan, China. We found that, for maintaining invariably high growth rates across wet to dry seasons, the eight mono-planted fast-growing tree species had comparable transpiration rates and very high soil water uptake, which in turn led to a large (3 times) reduction in soil water content from the wet to dry seasons in this reforested area. Moreover, soil water content for the adjacent undisturbed tropical rainforest was much higher (1.5 to 5 times) than that for the reforested area in both wet and dry seasons. Thus, the invariably very high water demand from the wet to dry seasons for the mono-planted fast-growing species possesses difficulty in the recovery of soil water content. We suggest, in the next step, to mix many native-species along with the currently planted fast-growing nonnative species in this reforestation project to recover soil water content.https://www.mdpi.com/2073-4441/12/11/3077deforestationfreshwater scarcityhydraulic response to seasonal droughtlimited leaf water supplyrecovery of soil water contenttropical rainforest reforestation |
| spellingShingle | Wenjun Hong Jindian Yang Jinhuan Luo Kai Jiang Junze Xu Hui Zhang Reforestation Based on Mono-Plantation of Fast-Growing Tree Species Make It Difficult to Maintain (High) Soil Water Content in Tropics, a Case Study in Hainan Island, China Water deforestation freshwater scarcity hydraulic response to seasonal drought limited leaf water supply recovery of soil water content tropical rainforest reforestation |
| title | Reforestation Based on Mono-Plantation of Fast-Growing Tree Species Make It Difficult to Maintain (High) Soil Water Content in Tropics, a Case Study in Hainan Island, China |
| title_full | Reforestation Based on Mono-Plantation of Fast-Growing Tree Species Make It Difficult to Maintain (High) Soil Water Content in Tropics, a Case Study in Hainan Island, China |
| title_fullStr | Reforestation Based on Mono-Plantation of Fast-Growing Tree Species Make It Difficult to Maintain (High) Soil Water Content in Tropics, a Case Study in Hainan Island, China |
| title_full_unstemmed | Reforestation Based on Mono-Plantation of Fast-Growing Tree Species Make It Difficult to Maintain (High) Soil Water Content in Tropics, a Case Study in Hainan Island, China |
| title_short | Reforestation Based on Mono-Plantation of Fast-Growing Tree Species Make It Difficult to Maintain (High) Soil Water Content in Tropics, a Case Study in Hainan Island, China |
| title_sort | reforestation based on mono plantation of fast growing tree species make it difficult to maintain high soil water content in tropics a case study in hainan island china |
| topic | deforestation freshwater scarcity hydraulic response to seasonal drought limited leaf water supply recovery of soil water content tropical rainforest reforestation |
| url | https://www.mdpi.com/2073-4441/12/11/3077 |
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