REU:  Collaborative Research:  Influence of Rhizosphere-    Mycosphere Chemistry on Phosphorus Dynamics in an Arid      Ecosystem
{'Code': '08010208', 'Directorate': {'Abbreviation': 'BIO', 'LongName': 'Direct For Biological Sciences'}, 'Division': {'Abbreviation': 'DEB', 'LongName': 'Division Of Environmental Biology'}}
{'SignBlockName': 'James R. Gosz', 'PO_EMAI': None, 'PO_PHON': None}
Previous studies have demonstrated the importance of                       mycorrhizae in utilizing P from "stable" inorganic pools and                    implicated CO2 and oxalate in differential use of ortho-P pools.                Moreover, the ability of some early colonizing species (e.g.                    Halogeton glomeratus, Salsola kali) to produce oxalate has led to               the hypothesis that interactions of plant or associated fungal                  exudates with the soil matrix plays a pivotal role in P dynamics                in arid ecosystems.  The proposed research focuses on two                       weathering agents, CO2 and oxalate,  which act to enhance P                     release from the inorganic pool.  In turn, the induced shift in P               partitioning among pools influences succession.  The hypotheses                 will be tested through a series of experiments at theoretical and               ecosystem levels.  The experiments are a logical progression                    toward evaluation of the hypotheses.  Specifically, the project                 will determine:                                                                 1.   The existence of oxalate in archived soils from a past                          successional study, in lysimeter and in field soils;                       2.   The effect of oxalate driven Ca-phosphate mineral weathering                    on succession;                                                             3.   The rates of oxalate production in systems of varying P                         availability;                                                              4.   The rate of reaction of CO2 or oxalate with soil minerals                       involved in P release;                                                     5.   The potential rate of oxalate degradation;                                 6.   Models of dynamic and equilibrium conditions for CO2 and                        oxalate reactions with Ca-phosphate minerals;                              7.   Laboratory, lysimeter and field tests of P chemistry models.                                                                                                                                                                                The results of these experiments will provide a mechanistic                    model of some processes which affect P cycling and early                        succession in a semiarid ecosystem.                                                  The investigators are well qualified to perform this type of               research and the facilities are adequate.
[{'FirstName': 'Edith', 'LastName': 'Allen', 'PI_MID_INIT': 'B', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Edith B Allen', 'EmailAddress': 'edith.allen@ucr.edu', 'NSF_ID': '000096566', 'StartDate': '03/15/1989', 'EndDate': None, 'RoleCode': 'Principal Investigator'}, {'FirstName': 'Michael', 'LastName': 'Allen', 'PI_MID_INIT': 'F', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Michael F Allen', 'EmailAddress': 'michael.allen@ucr.edu', 'NSF_ID': '000410442', 'StartDate': '03/15/1989', 'EndDate': None, 'RoleCode': 'Co-Principal Investigator'}]
{'Name': 'San Diego State University Foundation', 'CityName': 'SAN DIEGO', 'ZipCode': '921821901', 'PhoneNumber': '6195945731', 'StreetAddress': '5250 CAMPANILE DR', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'California', 'StateCode': 'CA', 'CONGRESSDISTRICT': '51', 'CONGRESS_DISTRICT_ORG': 'CA51', 'ORG_UEI_NUM': 'H59JKGFZKHL7', 'ORG_LGL_BUS_NAME': 'SAN DIEGO STATE UNIVERSITY FOUNDATION', 'ORG_PRNT_UEI_NUM': 'H59JKGFZKHL7'}
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[{'Code': '112800', 'Text': 'Population & Community Ecology'}, {'Code': '912000', 'Text': 'CROSS-DIRECTORATE PROGRAMS'}, {'Code': '914500', 'Text': 'SPECIAL PROGRAMS-RESERVE'}]
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