Job insecurities mar Spain's labour rebound

* Spanish unemployment rate starting to fall

* But precarious temporary jobs abound

* Heightening insecurities despite recovery

* Weighing on general election due November

By Sarah White

MADRID, July 23 (Reuters) - Eric Martin, a freelance property agent, also drives trucks and sometimes moonlights as a football referee. After more than 10 years of odd jobs, he has still not landed the one thing he really wants - a permanent contract, in any position.

The 31-year-old Spaniard, who has also worked as a lifeguard, store assistant and postman, says he cannot provide properly for his growing family as long as he does only temporary jobs.

"It's not giving me the security my family needs," says Martin, whose wife is expecting their second child.

As Spain emerges from a deep downturn, short-term job contracts like Martin's are helping to chip away at an unemployment rate that affects nearly a quarter of the workforce and is second only to Greece's in Europe.

But they are accentuating a two-tier labour market that during Spain's recent double-dip recession left temporary workers first in the firing line, regardless of their performance at work. Most of the three million jobs lost over the past seven years were held by these short-term contract workers, many of whom were in their twenties and thirties.

This generation has been unable to get mortgage loans to buy a home or start families and advance careers in what economists predict will hold back the Spanish economy for years to come.

Numbers of temporary workers have grown steadily over the past three decades. Short-term contracts account for nearly a quarter of all positions. That's less than before the downturn, but far more than anywhere else in the euro zone. Proportionately, these jobs are now proliferating at double the rate of permanent ones.

For centre-right Prime Minister Mariano Rajoy, a job recovery based on part-time contracts is a mixed blessing, as his government trumpets its handling of Spain's economic recovery before elections at the end of this year.

The government says 600,000 jobs will be created this year, the biggest annual employment jump since 2005. Figures due to be released on Thursday are expected to show unemployment fell sharply in the second quarter of 2015. And Spanish national economic output should rise by more than three percent this year, more than in most other European countries.

Yet this is not translating into better living standards for many Spaniards, partly because of their precarious employment conditions. According to official data, temporary workers made an average of 15,433 euros ($16,826) in 2013, 36 percent less than permanent employees.