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The effects of drought on rainforests will soon become apparent on a long-term scale

Cumulative droughts have a devastating effect on the Xishuangbanna rainforest. Credit: Zhou Liguo

Previous studies have shown that drought adversely affects rainforests, including loss of carbon sinks, increased mortality, and reduced photosynthetic capacity. However, due to the tendency of the region to recover, there is insufficient research on the effects of occasional droughts on rainforests. From such a drought within a few years.


In a study published in Agriculture and forest meteorologyResearchers at the Xishuangbanna Tropical Botanical Garden (XTBG) of the Chinese Academy of Sciences have investigated the effects of long-term drought. Tree growth Rainforest mortality dynamics, soil carbon exchange, and nutritional status.

Researchers have observed penetrating drops, field tree dynamics, and polyethylene baffle interception of soil CO.2 A drought plot with a size of 30m x 30m was established at XTBG in 2011, resulting in a 10-year flux under relatively light transmission reduction conditions.

Using vortex covariance and environmental data, they conducted an ecosystem drought sensitivity analysis for 12 consecutive years to investigate the net carbon exchange drought sensitivity in rainforests at various time scales.

The results showed that the long-term drought led to a sharp decline in the plant carbon pools of the Xishuangbanna rainforest.Radial growth rate with tags that survived wood There were no restrictions due to drought. In the 10th year of the drought simulation, the abundance of seedlings dropped dramatically.

They also found that large trees and saplings were vulnerable to drought, but medium-sized trees performed relatively well (lower mortality) in reducing fall than control plots.

In addition, rainforests have shown strong resilience to short-term droughts.Net ecosystem carbon Vortex covariance flux site exchange was insensitive to soil drought on an annual scale, but photosynthetic photoresponsive parameters were suppressed by drought on a 10-year scale.

The results of both drought experiments and flux data analysis show the effects of drought. Rainforest It will be very obvious in the long run.

“Our research provides baseline information for quantitatively assessing future changes. tropical rain forest Long-term northern end of East Asia Drought Conditions “.


Small trees give hope to the rainforest


For more information:
Liguo Zhou et al, Cumulative Drought has devastating effects on rainforests at the northern tip of Asia-based on decades of dendritic measurements and eddy covariance methods. Agriculture and forest meteorology (2022). DOI: 10.1016 / j.agrformet.2022.108858

Quote: The effects of drought on rainforests are on a long-term scale (2022) obtained on February 8, 2022 from https: //phys.org/news/2022-02-drought-impacts-rainforests-readily-apparent.html. It will be revealed soon (February 8, 2014).

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The effects of drought on rainforests will soon become apparent on a long-term scale

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