Földalatti sivatagok homoki erdők hatása a mélyebb talajrétegekre /
It is well known how trees can moderate understory microclimatic conditions compared to grasslands but fewer studies investigate the effects on deeper soil layers. The objectives of this study were to characterize the annual dynamics of vertical soil moisture distribution under compared to grassland...
Elmentve itt :
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| Dokumentumtípus: | Könyv része |
| Megjelent: |
2019
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| Sorozat: | Móra Akadémia
7 Móra Akadémia : szakkollégiumi tanulmánykötet 7. 7 |
| Kulcsszavak: | Erdők, Talaj |
| Online Access: | http://acta.bibl.u-szeged.hu/62351 |
| Tartalmi kivonat: | It is well known how trees can moderate understory microclimatic conditions compared to grasslands but fewer studies investigate the effects on deeper soil layers. The objectives of this study were to characterize the annual dynamics of vertical soil moisture distribution under compared to grasslands on sandy soils and to assess whether the functional types of the tree species influence their effect. We monitored the soil moisture content in adjacent poplar, robinia and pine forests and grasslands in 120 cm deep sections with eight spatial replicates over an entire year. We also measured the near-surface microclimate. Our results showed that canopies can temper microclimatic extremes all over the year and create moister topsoil conditions compared to grasslands. Regarding deeper soil layers, in grasslands we found about 5% soil moisture all over the year, while the lower soil layers of forests were significantly drier from spring till autumn. Moisture deficit became apparent in pine, poplar and robinia forests from March, April and May, respectively. The soil moisture resources were recharged between October and December. The results of the present study indicate that the cost of the microclimate-moderating effect of trees is severe depletion of deep moisture resources due to water-uptake by the roots and the interception of precipitation by the canopy. These effects are most pronounced in pine plantations. In our study we described extremely dry lower layers of sandy soils under forests, which can contribute to regional water balance problems and to the deficient recruitment of certain native trees. |
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| Terjedelem/Fizikai jellemzők: | 133-167 |
| ISSN: | 2064-809X |