Skip to main content
U.S. flag

An official website of the United States government

Hydraulic redistribution of water from Pinus ponderosa trees to seedlings: evidence for an ectomycorrhizal pathway.

Author(s):

J. Renee Brooks
Joyce L. Eberhart

Year:

2008

Publication type:

Scientific Journal (JRNL)

Primary Station(s):

Pacific Northwest Research Station

Source:

New Phytologist. 178: 382-394

Description

Although there is strong evidence for hydraulic redistribution (HR) of soil water by trees, it is not known if common myconhizal networks (CMN) can facilitate HR from mature trees to seedlings under field conditions. Ponderosa pine (Pinus ponderosa) seedlings were planted into root-excluding 61-micron mesh barrier chambers buried in an old-growth pine forest. After 2 yr, several mature trees were cut and water enriched in D2O and acid fuchsin dye was applied to the stumps. Fine roots and mycorrhizal root tips of source trees became heavily dyed, indicating reverse sap flow in root xylem-transported water from stems throughout root systems to the root hyphal mantle that interfaces with CMN. Within 3 d, D20 was found in mesh-chamber seedling foliage > 1 m from source trees; after 3 wk, eight of 10 mesh-chamber seedling stem samples were significantly enriched above background levels. Average mesh-chamber enrichment was 1.8x greater than that for two seedlings for which the connections to CMN were broken by trenching before D20 application. Even small amounts of water provided to mycorrhizas by HR may maintain hyphal viability and facilitate nutrient uptake under drying conditions, which may provide an advantage to seedlings hydraulically linked by CMN to large trees.

Citation

Warren, Jeffrey M.; Brooks, J. Renee; Meinzer, Frederick C.; Eberhart, Joyce L. 2008. Hydraulic redistribution of water from Pinus ponderosa trees to seedlings: evidence for an ectomycorrhizal pathway. New Phytologist. 178: 382-394

Publication Notes

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
https://www.fs.usda.gov/treesearch/pubs/30445